Intuition. You know the truth by the way it feels.
"Come, let us go and try it. Why dream about it" -Fyodor Dostoyevsky
A large intelligence and a deep heart.
quotes from dostoevsky - Google Search
Free thinkers are those who are willing to use their minds without prejudice and without fearing to understand things that clash with their own customs, privileges, or beliefs. Leo Tolstoy. Free Spirit Girl
"Pain and suffering are always inevitable for a large intelligence and a deep heart. The really great men must, I think, have great sadness on earth". Crime and Punishment