Nichiren quoting Chapter 4 of the Lotus Sutra

 “The World-Honored One in his great mercy makes use of a rare thing, in pity and compassion teaching and converting, bringing benefit to us. In numberless millions of kalpas who could ever repay him? Though we offer him our hands and feet, bow our heads in respectful obeisance, and present all manner of offerings, none of us could repay him. Though we lift him on the crown of our heads, bear him on our two shoulders, for kalpas numerous as Ganges sands reverence him with all our hearts; though we come with delicate foods, with countless jeweled robes, with articles of bedding, various kinds of potions and medicines; with ox-head sandalwood and all kinds of rare gems, construct memorial towers and spread the ground with jeweled robes; though we were to do all this by way of offering for kalpas numerous as Ganges sands, still we could not repay him.” -- Lotus Sutra Chapter 4