Cowboy,
Buddha’s original philosophy was about learning to free oneself from the bonds of suffering. This was to be done by realizing that desire causes our suffering. The suffering he is addressing is psychological suffering. The desire he speaks of is simply wanting what we cannot or do not have. Whenever I want something I cannot have I experience internal stresses cause by that desire. This results in anxiety, anger, frustration, unhappiness depression, etc.
Humans have the tendency to expect life to conform to our wishes, which is somewhat ridiculous because even simple experiences will demonstrate to us that life does not care what we want; life was not put here for our personal conveniance. It is our responsibility to conform ourselves with the process of life. In China this is called following the Tao. That is, bringing ourselves into accord with the natural rhythms and flow of life. We are not guaranteed success, or riches, or true friends or anything else. Any time we depend on such things for our happiness and lose them, we experience an emotional crisis. This is depending on transitory phenomena for our wellbeing.
This does not mean that we have to be passive, sit back and take whatever life dishes out. It means that we are to not depend our happiness upon what the world system provides us. All these things are fleeting and impermanent and therefore illusion. When I depend on others to make me feel valuable as a person, or I depend on money to make me feel secure or free, I am depending on transitory phenomena. When these things are removed from my life I experience emotional pain and personal dissonance. We are responsible for creating our own suffering through the state of mind that we choose to have. When we live in the world, but are not emotionally attached to the processes and events that occur, we are free. We experience an abundance of energy because we are not dissipating our energy on transitory emotional phenomena.
Buddha did not address the afterlife, god, mystical experience, etc. because these are phenomena that cannot be proven to others and have no real bearing upon happiness or the elimination of suffering. For example: the fear of no afterlife, or fear of hell, or hope for a pleasant afterlife comes from an emotional need to be reassured about the continuance and condition of our identity after death. When an individual feels in this manner, their comfort or happiness is dependent upon a fact or phenomena that cannot be proven or experienced until one dies. No matter what an individual chooses to believe in this life, it is only a belief and cannot be proven until they die. So why become preoccupied with phenomena that are ultimately un-provable when there is an attitude of life one can cultivate that will make such concerns unimportant. These fears only bring dissonance and unhappiness. The consequence of attaining Buddhahood or nirvana resolves these concerns for the individual.
Further, these concerns are based upon the illusion of an individual identity that continues. This is an illusory perception. We are not what we believe ourselves to be. Our personal identities are based upon the continuum of time. We appear to ourselves to be the same person as we live our life. This is because the process of growth occurs in a manner such that our personal identity experiences no drastic, sudden changes. Imagine if you were 5 years old and woke up one morning and you were the person you were when you were 15 years old. Without the process of time you would experience a mental breakdown because you would have thoughts and memories that you have not experienced as a process, they would have appeared suddenly and you would not recognize yourself as you. You would think you were someone else. Who you were at age 5 is related to whom you were at age 15 years and age 20 years and at age 50 years, but you are not the same identity. You have changed over time. You are related to each of those identities, but you are not those identities.
Who we truly are is that something, often called the super-ego or higher-self or atman (in Hinduism) that transcends the limitation of who we believe ourselves to be. Think of it as: Our true identity is the pallet upon which we paint our lives and we confuse the painting which is transitory with the pallet which is eternal.
I hope some of this addresses your concerns.
Scott