A drop of ocean water is a delicacy that includes the five elements of flavor. Moreover, whereas a drop of river water is like an ordinary pill, a drop of ocean water is a panacea. In this regard “Namu Amida-butsu” is a drop of river water while “Namu Myōhō Renge Kyō” is a drop of ocean water. The Amitābha Sūtra is a drop of minor river water while a character of the Lotus Sūtra is a drop of ocean water.
The sins of the late Lord Shichirōgorō accumulated during his life span of 16 years (in a family of warriors, whose duty is to kill living beings) are as minimal as a drop of a small river water while his faith in “Namu Myōhō Renge Kyō,” though for a short while, is as precious as a drop of ocean water. Thus, there should be no doubt about the attainment of Buddhahood by the late Lord Shichirōgorō.
Ueno-dono Gohenji, Reply to Lord Ueno, Writings of Nichiren Shōnin, Followers II, Volume 7, Page 48