Meditation and yoga are the best methods for seeing the truth garunteed. A few months ago, some kid at this college was experimenting with DMT and meditation searching for enlightenment or a greater truth. People said he was never a violent person, came from a foster home, but seemed like a he was doing very well. He took DMT and beat one of his classmates to death and nearly another with a baseball bat. This is an extremely unusual case, but technically it could happen to anyone. I personally have had an enlightening experience after going though a really tramatic event. The first part of it is known as ego death, for me this is was by far and above the most excrutiating pain i've ever been through, for a while it felt like i was 1,000 times as sensitive to everything around me as normal, but after a couple months i had a completely opposite experience. It was like a release of all the suffering i had been enduring. Your body and mind become one with everything and you feel like you are some sort of spiritual being having an awkening. Most amazing thing anyone can experience, but its not a good idea through drugs. Buddhist monks spend many years before reaching nirvana, but all through the practice of meditation and yoga etc.