More valuable than treasures in a storehouse are the treasures of the body, and the treasures of the heart are the most valuable of all. From the time you read this letter on, strive to accumulate the treasures of the heart!"
(The Three Kinds of Treasure - The Writings of Nichiren Daishonin, Vol.1, page 851)

Life is the foremost of all treasures. It is expounded that even the treasures of the entire major world system cannot equal the value of one’s body and life. Even the treasures that fill the major world system are no substitute for life.
Nichiren Daishonon. WND 1125