Allan Kardec-THE Spirit's Book_ The Principles of Spiritist Doctrine (1989)

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THE SPIRITS’ BOOK
Its guidance almost always makes itself felt, and sometimes more surely than that of reason. It
never goes astray."
- Why is it that reason is not always an infallible guide?
"It would be infallible if it were not perverted by a false education, by pride, and by
selfishness. Instinct does not reason. Reason leaves freedom to choice, and gives man freewill."
Instinct is a rudimentary intelligence, differing from intelligence properly so called in this particular, viz.,
that its manifestations are almost always spontaneous, whereas those of intelligence are the result of
combination and of deliberation.
The manifestations of instinct vary according to the differences of species and of their needs. In beings
that possess self-consciousness and the perception of things external to themselves, it is allied to
intelligence, that is to say, to freedom of will and of action.