Vedanta is the last word in Vedic wisdom, and the author and knower of the Vedanta philosophy is Lord Krishna; and the highest Vedantist is the great soul who takes pleasure in chanting the holy name of the Lord. That is the ultimate purpose of all Vedic mysticism.
Bhagavad-gita 2.46,
Srila Prabhupada
Fulfilling the demands of the body is animal life, and fulfilling the mission of the spirit soul is the human mission.
Srimad Bhagavatam 3.3.19,
Srila Prabhupada
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, not some weak sentiments. So try for this, to give all men this Krishna Philosophy and many real devotees will come with us back to home, back to Godhead.
Everything in this material world is subject to perish in due course of time.
Srimad Bhagavatam 4.24.56,
Srila Prabhupada