It was merely the name men gave to their mistakes.

Moralists had, as a rule, regarded it as a mode of warning, had claimed for it a certain ethical efficacy in the formation of character, had praised it as something that taught us what to follow and showed us what to avoid.

But there was no motive power in experience.

It was as little of an active cause as conscience itself.
All that it really demonstrated was that our future would be the same as our past, and that the sin we had done once, and with loathing, we would do many times, and with joy.
It was clear to him that the experimental method was the only method by which one could arrive at any scientific analysis of the passions; and certainly Dorian Gray was a subject made to his hand, and seemed to promise rich and fruitful results.

His sudden mad love for Sibyl Vane was a psychological phenomenon of no small interest.