The natural cause of the human mind is certainly from credulity to skepticism.

I believe that every human mind feels pleasure in doing good to another.

The deepest sin of the human mind is to believe things without evidence

Bodily decay is gloomy in prospect, but of all human contemplations the most abhorrent is body without mind.

All the efforts of the human mind cannot exhaust the essence of a single fly.

People will always prefer black-and-white over shades of grey, and so there will always be the temptation to hold overly-simplified beliefs and to hold them with excessive confidence