The beginning of wisdom is the awareness that there is insufficient evidence that a god or gods have created us and the recognition that we are responsible in part for our own destiny. Human beings can achieve this good life, but it is by the cultivation of the virtues of intelligence and courage, not faith and obedience, that we will most likely be able to do so.
Human life has no meaning independent of itself. There is no cosmic force or deity to give it meaning or significance. There is no ultimate destiny for man. Such a belief is an illusion of humankind's infancy. The meaning of life is what we choose to give it. Meaning grows out of human purposes alone. Nature provides us with an infinite range of opportunities, but it is only our vision and our action that select and realize those that we desire.
It is not the courage to be that we must develop as much as the courage to become. We are responsible for our destiny. The meaning of life is not located in some hidden crevice in the womb of nature but is created by free persons, who are aware that they are responsible for their own futures and have the courage to take this project into their own hands.