To use your first mind, simply have an open minded perspective, a rational view, and broader perception. An example of using this first mind, would be this scenario: "Hey how are you doing?" says a friend as she taps you on shoulder and looks into your eyes with a bright smile, instead of just responding to the question, and thus forming the thoughts to do so, take about a split second an analyze things, or rather, think, with your first mind before any thoughts formed, that way you prevent yourself from mixing the irreverent, or false information, with the relevant and true information, that coexist in the common thought, separate them, and progress, in the realm of thoughts and ideas. In the first mind, right between your subconscious, and conscious mind, you will most likely be able to see that your friend is happy, she wants to talk you, and she probably wants to talk to you about something. All of these things are fairly simple and probably wouldn't take much time to figure out, once you get in the habit of using your first mind, this will start to come naturally to you. Rather then simply saying, "Oh I'm fine, how are you" which is fine, its much better than "oh I'm fine", because that would be rude, but whats better then both of those responses would be something along the lines of "I'm doing fine (she's happy and wants to talk, and she probably has something specific she wants to talk about) things aren't too bad for me, and by the looks of it, you'redoing great!, why are you so happy, whats new?". This shows your friend that you're noticing her, paying close attention to her, and you really care what she has to say, and though, with an increased understanding of thoughts, and the human mind, that could easily be a fabricated illusion, if you keep it genuine, you may very well progress, not only the realm of thoughts and ideas, but also in communication, conversation, and socialization.
Now that real thought has been discovered, the next thing that essential to learn is the function of thoughts through time, and how those different types of thought, are different. The interesting thing about the human mind, is that it transcends the time barriers of the linear order of time in the physical world,the concept of past, present, and future, in that order, each in an independent area of time in physical world. In the world of minds, which can be discovered as what some call, 'the mental realm' time is kaleidoscopic, past, present, and future, can all exist in the same place, the mental realm, or plane is an actual place, just as the astral plane, and the physical plane are also places. The interesting thing about the mental realm though, is that we experience it for the entirety of our existence, and before we even see the physical world in front of us, we first see our minds, we see through our minds, and we also see with our minds. The physical world begins to look fake, or, less real, once you really start to understand how withdrawn the human species is from this world, humans don't even really seem to be in the physical world, its simply where everything is, put, where everything, interacts, but, the most common place human beings go, is conversation, or rather, 'into the minds of one and other', humans also go insane after attempting to exist solely in the physical world for a prolonged period of time, sleep deprecation (prevention of visiting an area the astral plane), or a deprivation socialization (prevention of visiting an area of the mental plane).
The 'past', 'present', and 'future', all 'exist' inside the human mind, which would mean, they all exist in the same place, using further deductive logic, that would mean that they all also exist in the same place, in time, meaning there are three 'articles of time' existing within one article of time, the present, this is because the only time that actually exists, is the present, and linear time only exists within the minds of human beings. This is a bold claim, so I'll remind you that this only a theory, but I personally believe this to be true, and I also believe that it makes sense. Now that the foundation has been built, I will elaborate further, into the three 'linear temporal' type thoughts, and the the one 'present' type thought. The three linear temporal thoughts, are memories (past), ideas (linear present), and predictions (future).A memory is a thought that exists in the linear past within a human mind, but unlike simply a thought, it is a collage of multiple thoughts that have formed a more concrete thought, and thus evolved in the realm of thoughts and ideas, into a memory, or a piece of the perceived past, within a human mind.
Memories connect humans to one and other, and build familiarity, comfort, and ease, among the human population. One can 'learn to love' through spending time someone for a prolonged period, even if it isn't real love ('love at first sight', true connection of souls, read "How to find your soulmate", and "What is love" if you want to learn more about this), but the love becomes 'real' through the comfort of a large array of memories, both mental, and emotion memories, (read "The mechanics of the human heart" for more depth on emotional and mental memories). The concept of "better the devil we know", is also a result of the phenomena of human memories, for memories build understanding and connection, and understanding and connection, result in comfort and ease, or sometimes, precaution, when a baby or child learns that falling hurts, that child will most likely be more cautious in high places after relearning this a few times, as a result of the memory, falling, and the memory of the pain caused by the fall.
The third linear temporal type of thought, is a prediction, which is the attempt to think in the future about something or many things, and as human beings, we posses this ability. We can plan, we can look forward to something, expect, and we can hope, all of these are types of predictions, although each one has its own layers of complexities to it. The human ability to 'see into the future' although, not always accurately, is one of our most special powers, our societies, our lives, our minds, can utilize this strange ability to think about things before they happen, and thus 'think in the future' to advance ourselves into a world full of meaning, purpose, and hope, but also at the same time, it can cause us anxiety and negative expectations, which pollute the mind, and ultimately corrupts the individual. The one present type of concrete thought, is a perception. A perception is the lens, and world, and reality, which we see the world and reality with. Understanding your perception, is key to evolving, and developing a broader and more rational, open minded, and understanding perception. Having a negative perception, results in a negative individual, which can cause negative things, exhibit negative actions, and say negative things, in other words, the construction of a negative perception will destroy any individual, and many other individuals around this individual, and can often spread like a disease among people who are weak minded, or evil. On the other hand, having a positive perception, typically results in thinking about positive things, doing, and saying positive things, and carrying with you, a positive vibration, and a positive outlook on life, because of your positive perception.
The example was based on something more commonly understood so that it is easier to grasp, though the perception of actuality, and actual things, such as true, love, or true meaning, or simply, the truth, is a journey one must embark on for themselves, for it is both easy to explain, and impossible to explain at the same time. The human mind is extremely complex, and I believe, exists as a world of its own, with a larger world, or dimension, quite possibly the mental realm. The brain, is simply the physical manifestation of the human mind, one can leave their entire body and brain, and still be able to think, one can also awaken in dreams (lucid dream) and posses their own conscious mind, so the theory that dreams are simply part of your subconscious mind, doesn't really make much sense. The interesting thing about the brain is, if you look at the way the synaptic connections and neurons, and axons, in the brain, cells in the brain, they almost seem to mirror the imagine of the physical universe. So the human mind, which I believe to be a world of its own, also looks the part in its physical manifestation.