Meditation, but not that commercialized, yogi, fake transcendental, empty-your-mind shit, but simply isolating myself from outside world for a while and letting my mind develop on the issue at hand.
Drugs are useless to me. Maybe I do get awesome ideas, but I lose any motivation to materialize them.
"The Devil is not the Prince of Matter; the Devil is the arrogance of the spirit, faith without smile, truth that is never seized by doubt. The Devil is grim because he knows where he is going, and, in moving, he always returns whence he came."