The goal of evolution is self - conquest
In order to have friends, you must first be one.
Make two grins grow where there was only a grouch before.
The reason men oppose progress is not that they hate progress, but that they love inertia.
When a man sends you an impudent letter, sit right down and give it back to him with interest ten times compounded, and then throw both letters in the wastebasket.
The best preparation for good work tomorrow is to do good work today.