"Two things, almost incompatible, are united in me in a manner which I am unable to understand: a very ardent temperament, lively and tumultuous passions, and, at the same time, slowly developed and confused ideas, which never present themselves until it is too late. One might say that my heart and my mind do not belong to the same person. Feeling takes possession of my soul more rapidly than a flash of lightning; but, instead of illuminating, inflames and dazzles me. I feel everything and see nothing. I am carried away by my passions, but stupid; in order to think, I must be cool. The astonishing thing is that, notwithstanding, I exhibit tolerably sound judgement, penetration, even finesse, if I am not hurried; with sufficient leisure I can compose excellent impromptus; but I have never said or done anything worthy of notice on the spur of the moment."
January 1, 1970
https://en.wikiquote.org/wiki/Confessions_(Rousseau)