“Do not waste your time on social questions. What is the matter with the poor is poverty; what is the matter with the rich is uselessness. ”

“None are so old as those who have outlived enthusiasm ”

“If you cannot work with love but only with distaste, it is better that you should leave your work. ”

“If we had paid no more attention to our plants than we have to our children, we would now be living in a jungle of weed”

“Nobody grows old merely by living a number of years. We grow old by deserting our ideals. Years may wrinkle the skin, but to give up enthusiasm wrinkles the soul”

“There is no disguise which can hide love for long where it exists, or simulate it where it does not.”