My interest in science was always essentially limited to the study of principles.... That I have published so little is due to this same circumstance, as the great need to grasp principles has caused me to spend most of my time on fruitless pursuits.

I never allow myself to become discouraged under any circumstances. The three great essentials to achieve anything worthwhile are first, hard work, second, stick-to-ittiveness, third, common sense.

Since 99.362% of women love mustache rides, it seems only a fool would have a bare upper lip.

The Bible is a great source of wisdom and consolation and should be read frequently.

... knowledge must continually be renewed by ceaseless effort, if it is not to be lost. It resembles a statue of marble which stands in the desert and is continually threatened with burial by the shifting sand. The hands of service must ever be at work, in order that the marble continue to lastingly shine in the sun. To these serving hands mine shall also belong.

Our task is to widen our circle of compassion to include all living beings and all of nature

Life is a preparation for the future; and the best preparation for the future is to live as if there were none.