He who can no longer pause to wonder and stand rapt in awe, is as good as dead; his eyes are closed.

There exists a passion for comprehension, just as there exists a passion for music. That passion is rather common in children, but gets lost in most people later on. Without this passion there would be neither mathematics nor natural science.

Nationalism is an infantile disease. It is the measles of mankind.

Remember today, for it is the beginning of always. Today marks the start of a brave new future filled with all your dreams can hold. Think truly to the future and make those dreams come true.

To obtain an assured favorable response from people, it is better to offer them something for their stomachs instead of their brains.

My deep religiosity [...] found an abrupt ending at the age of twelve, through the reading of popular scientific books.

The ideals which have always shone before me and filled me with the joy of living are goodness, beauty, and truth. To make a goal of comfort or happiness has never appealed to me; a system of ethics built on this basis would be sufficient only for a herd of cattle.