Our worst foes are not belligerent circumstances, but wavering spirits.

I know no study that will take you nearer the way to happiness than the study of nature - and I include in the study of nature not only things and their forces, but also mankind and their ways, and the moulding of the affections and the will into an earnest desire not only to be happy, but to create happiness.

While the right friends are near us, we feel that all is well. Our everyday life blossoms suddenly into bright possibilities.

It is not possible for civilization to flow backwards while there is youth in the world. Youth may be headstrong, but it will advance it allotted length.

Life is an exciting business, and most exciting when it is lived for others.

It gives me a deep comforting sense that Things seen are temporal and things unseen are eternal.

If we do not like our work, and do not try to get happiness out of it, we are a menace to our profession as well as to ourselves.