Buddhist Morning Thought #22, Buddhism For All

Grass without roots will die in no time, and a river without a source will not flow far. A child without parents is looked down upon. Nam-myoho-renge-kyo, the heart of the "Life Span" chapter, is the mother of all Buddhas throughout the ten directions and the three existences. (WND, 184)

Buddhist Morning Thought #40, Enlightenment

 This teaching was not propagated in the Former or Middle Day of the Law because the other sutras had not yet lost their power of benefit. ...