We should perceive that man's period of historical existence, a period so short that his physical constitution has not been altered in the slightest degree, is insufficient to allow of any considerable mental change.

The man or nation of high culture may acknowledge to great lengths the restraints imposed by conventions and honour, but beyond a certain point, primitive will or desire cannot be curbed.

Man's respect for the imponderables varies according to his mental constitution and environment. Through certain modes of thought and training, it can be elevated tremendously, yet there is always a limit.

H. P. Lovecraft Quotes