“Both thought and feeling are determinants of conduct, and the same conduct may be determined either by feeling or by thought.”
Lecture XX, "Conclusions"
1900s, The Varieties of Religious Experience (1902)
Context: Both thought and feeling are determinants of conduct, and the same conduct may be determined either by feeling or by thought. When we survey the whole field of religion, we find a great variety in the thoughts that have prevailed there; but the feelings on the one hand and the conduct on the other are almost always the same, for Stoic, Christian, and Buddhist saints are practically indistinguishable in their lives. The theories which Religion generates, being thus variable, are secondary; and if you wish to grasp her essence, you must look to the feelings and the conduct as being the more constant elements. It is between these two elements that the short circuit exists on which she carries on her principal business, while the ideas and symbols and other institutions form loop-lines which may be perfections and improvements, and may even some day all be united into one harmonious system, but which are not to be regarded as organs with an indispensable function, necessary at all times for religious life to go on. This seems to me the first conclusion which we are entitled to draw from the phenomena we have passed in review.
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William James 246
American philosopher, psychologist, and pragmatist 1842–1910Related quotes

quoted by Tim Rutten in the Los Angeles Times, Saturday, October 7, 2006
“There is thought, and then there is thinking about thoughts, and they don't feel the same.”
Source: Girl, Interrupted

Source: Mind, Self, and Society. 1934, p. 1

Quoted as the opening passage of "BOOK ONE: The Functions of Language" in Language in Thought and Action (1949) by S. I. Hayakawa, p. 3
Words and Their Meanings (1940)
Context: A great deal of attention has been paid … to the technical languages in which men of science do their specialized thinking … But the colloquial usages of everyday speech, the literary and philosophical dialects in which men do their thinking about the problems of morals, politics, religion and psychology — these have been strangely neglected. We talk about "mere matters of words" in a tone which implies that we regard words as things beneath the notice of a serious-minded person.
This is a most unfortunate attitude. For the fact is that words play an enormous part in our lives and are therefore deserving of the closest study. The old idea that words possess magical powers is false; but its falsity is the distortion of a very important truth. Words do have a magical effect — but not in the way that magicians supposed, and not on the objects they were trying to influence. Words are magical in the way they affect the minds of those who use them. "A mere matter of words," we say contemptuously, forgetting that words have power to mould men's thinking, to canalize their feeling, to direct their willing and acting. Conduct and character are largely determined by the nature of the words we currently use to discuss ourselves and the world around us.

“The way you think determines the way you feel, and the way you feel determines the way you act.”

“Opinion is ultimately determined by the feelings, and not by the intellect.”
Pt. IV, Ch. 30 : General Considerations
Social Statics (1851)

The Unconscious and Repetition
The Four Fundamental Concepts of Psycho Analysis (1978)