Ice is made of water, but it is colder than water. Blue colored cloth is colored by indigo, but it will be bluer than indigo when dyed repeatedly. In the same fashion, if you pile up your faith in the Lotus Sutra, you will be filled with more vitality and blessings than other people.

Oto Gozen Go-shōsoku, A Letter to Lady Oto, Nyonin Gosho, Letters Addressed to Female Followers, Page 122-124