The Basis of Morality by Part 2 Chapter 6 Page 11

own ends; and to this effect he will give his reply immediately, and as it were mechanically, without so much as bestowing a thought on our ends; because it is his Will that directly dictates the answer, or ever the question can come before the bar of his real judgment. Hence he tries to mould our conduct to his own benefit, without even being conscious of it, and while he supposes that he is speaking out of the abundance of his discernment, in reality he is nothing but the mouth-piece of his own desire; indeed, such self-deception may lead him so far as to utter lies, without being aware of it.

So greatly does the influence of the Will preponderate that of the Intelligence. Consequently, it is not the testimony of our own consciousness, but rather, for the most part, that of our interest, which avails to determine