The Lotus Sūtra preaches in chapter 2, “Expedients,” of the first fascicle that to have the opportunity to hear teachers of this sūtra is rare even during innumerable kalpa (aeons) of time. The sūtra also states in chapter 14, “peaceful Practices,” of the fifth fascicle that it is difficult to hear even the title of the Lotus Sūtra in the innumerable countries. The above indicates how difficult it is for us to meet the Lotus Sūtra, and problems involved to even hear the title of the Lotus Sūtra. Therefore, the Suśānta Buddha and the Buddha of Many Treasures, who appeared in the world before the time of Śākyamuni Buddha did not even mention the title of the Lotus Sūtra. Even Śākyamuni Buddha, who appeared in this world to expound the Lotus Sūtra, did not reveal its title for 42 years, until at the age of 72 He finally chanted the Sūtra of the Lotus Flower of the Wonderful Dharma and expounded the sūtra for the first time in India. Nothing, however, not even the name of the sūtra was heard in such large countries as China, or Japan. Nothing about this sūtra was heard of for over 1,000 years after the extinction of the Buddha. Finally, after 1,350 years or so, only the title of the Lotus Sūtra was made known.
This is why the opportunity to encounter the Lotus Sūtra is compared to uḍumbara flowers, which are said to blossom only once in 3,000 years. The difficulty is also compared to the story of a one-eyed turtle finding a floating piece of wood in the ocean in order to dry its shell once in innumerable kalpa (aeons). Suppose that one sets up a needle on the earth and throws a poppy seed down from the palace of the King of the Mahā-brahman Heaven high up in the sky in such a way as the tip of the needle pierces through the seed. This is almost impossible, yet it is even more difficult to encounter the Lotus Sūtra after the passing of the Buddha. Suppose one sets up a needle on top of Mt. Sumeru and throws a piece of string on a windy day from another Mt. Sumeru standing too far to see. It is impossible to thread the needle set up on the first Mt. Sumeru. It is, however, even more difficult to experience the daimoku of the Lotus Sūtra.
Therefore, you should realize that being able to chant the daimoku of this sūtra is an experience more wonderful than a blind person gaining his eyesight and seeing his parents for the first time and rarer than a man being captured by a mighty enemy and being released by a special pardon to be reunited with his wife and children.
Hokke Daimoku Shō, Treatise on the Daimoku of the Lotus Sūtra, Writings of Nichiren Shōnin, Faith and Practice, Volume 4, Page 38-39