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- The best assurance any one can have of his interest in God, is doubtless the conformity of his soul to Him. When our heart is once turned into a conformity with the mind of God. when we feel our will conformed to His will, we shall then presently perceive a spirit of adoption within ourselves, teaching us to say, "Abba, Father."
- Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 16.
Treatise Concerning Eternal and Immutable Morality (1731) 
- The true knowledge or science which exists nowhere but in the mind itself, has no other entity at all besides intelligibility; and therefore whatsoever is clearly intelligible, is absolutely true.
- Ch. 5, sct. 7
- Knowledge is not a passion from without the mind, but an active exertion of the inward strength, vigour and power of the mind, displaying itself from within.
- Ch. 1, sct. 1
- Truth is the most unbending and uncompliable, the most necessary, firm, immutable, and adamantine thing in the world.
- Ch. 5, sct. 3
- If intellection and knowledge were mere passion from without, or the bare reception of extraneous and adventitious forms, then no reason could be given at all why a mirror or looking-glass should not understand; whereas it cannot so much as sensibly perceive those images which it receives and reflects to us.
- Ch. 1, sct. 3