"The only equitable manner in my opinion, of judging the character of a man is to examine if there are personal calculations in his conduct; if there are not, we may blame his manner of judging, but we are not the less bound to esteem him."

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There is a race between the increasing complexity of the systems we build and our ability to develop intellectual tools for understanding their complexity. If the race is won by our tools, then systems will eventually become easier to use and more reliable. If not, they will continue to become harder to use and less reliable for all but a relatively small set of common tasks. Given how hard thinking is, if those intellectual tools are to succeed, they will have to substitute calculation for thought.

— Leslie Lamport