The Basis of Morality by Part 1 Chapter 2 Page 14

Consequently Ethics will again be consigned to its former entirely helpless condition, there to remain, until I come to demonstrate the true moral principle of human nature — a principle which is incontestably efficient, and has its root in our very being. The latter, however, has no such broad basis to offer as the above-mentioned cushion; so that, doubtless, those who are accustomed to take things easily, will not abandon their comfortable old seat, before they are thoroughly aware how deeply the ground on which it stands is undermined.