Science is a systematic means of gaining reliable knowledge.

One of the saddest things about US education is that the wisdom of our most successful teachers is lost to the profession when they retire.

To the being of fully alive, the future is not ominous but a promise; it surrounds the present like a halo.

All learning begins when our comfortable ideas turn out to be inadequate.

The experience has to be formulated in order to be communicated.

Many of the obstacles for change which have been attributed to human nature are in fact due to the inertia of institutions and to the voluntary desire of powerful classes to maintain the existing status.

Hunger not to have, but to be