Finding a good friend is like a one-eyed turtle finding a floating log with a hollow in it the right size to hold him

The best way to attain Buddhahood is to encounter a good friend. How far can our own wisdom take us? If we have even enough wisdom to distinguish hot from cold, we should seek out a good friend. But encountering a good friend is the hardest possible thing to do. For this reason, the Buddha likened it to the rarity of a one-eyed turtle finding a floating log with a hollow in it the right size to hold him, or to the difficulty of trying to lower a thread from the Brahma heaven and pass it through the eye of a needle on the earth. -Nichiren

Wisdom for Modern Life by Daisaku Ikeda 21/5