Anything without substance will not last

Anything without substance will not last, so just demonstrate sincerely that we have got solid ground beneath us, not that we have only some sentiment, that’s all. Many fanatic spiritual movements have come and gone, but without the flawless philosophy of Krishna, they cannot stand. Therefore I want especially that my books and literature should be distributed profusely.This is our substance, real philosophical information.
Srila Prabhupada