The One-eyed Turtle and the Floating Log

The Buddha explained how difficult it is for a one-eyed turtle to find a floating sandalwood log with a suitable hollow, even after immeasurable, boundless kalpas. He employed this analogy to illustrate the rarity of encountering the Lotus Sutra. One should be aware, however, that, even if one should encounter the floating sandalwood log of the Lotus Sutra, it is rarer still to find the hollow of the Mystic Law of the daimoku, which is difficult to chant. 26/3

The Writings of Nichiren Daishonin
The One-eyed Turtle and the Floating Log
Written to the widow of the lay priest Matsuno on March 26, 1279