Those who draw their sustenance from science are blessed. It is for me to only derive an occasional pleasure. This is nothing worthy of conceit, but I am indeed touched by the joys. This book is an ode to such joys, a digest of my collections from various sources.
Pessimism is a form of mental dipsomania; it disdains healthy nourishment, indulges in the strong drink of denunciation, and creates an artificial dejection which thirsts for a stronger draught.
Children are living beings - more living than grown-up people who have built shells of habit around themselves. Therefore it is absolutely necessary for their mental health and development that they should not have mere schools for their lessons, but a world whose guiding spirit is personal love.
A teacher can never truly teach unless he is still learning himself. A lamp can never light another lamp unless it continues to burn its own flame. The teacher who has come to the end of his subject, who has no living traffic with his knowledge but merely repeats his lesson to his students, can only load their minds, he cannot quicken them.
I have on my table a violin string. It is free to move in any direction I like. If I twist one end, it responds; it is free. But it is not free to sing. So I take it and fix it into my violin. I bind it and when it is bound, it is free for the first time to sing.