Learn to see - accustoming the eye to calm, to patience, to letting-things-come-to-it; learning to defer judgment, to encircle and encompass the question on all sides.
We must be physicists in order to be creative since so far codes of values and ideals have been constructed in ignorance of physics or even in contradiction to physics.
But in the end one also has to understand that the needs that religion has satisfied and philosophy is now supposed to satisfy are not immutable; they can be weakened and exterminated. Consider, for example, that Christian distress of mind that comes from sighing over ones inner depravity and care for ones salvation - all concepts originating in nothing but errors of reason and deserving, not satisfaction, but obliteration.
The strong individual loves the earth so much he lusts for recurrence. He can smile in the face of the most terrible thought: meaningless, aimless existence recurring eternally. The second characteristic of such a man is that he has the strength to recognize - and to live with the recognition - that the world is valueless in itself and that all values are human ones. He creates himself by fashioning his own values; he has the pride to live by the values he wills.
I too have been in the underworld, as was Odysseus, and I will often be there again; not only sheep have I sacrificed so as to beable to speak with a few dead souls, but neither have I spared my own blood as well.