Truths cannot be acquired from words out of other people's mouths. Before Truths can be internalized, they must come from one's own realizations and practices. Through a lifetime of personal practice, human beings are capable of revealing all of the secrets of the cosmic essence. You are your own best judge.
There is no meditation without wisdom, and there is no wisdom without meditation. When a man has both meditation and wisdom, he is indeed close to nirvana.