Gravity is a response to geometry.

Lasting harmony with a woman (was) an undertaking in which I twice failed rather disgracefully.

An oligarchy of private capital cannot be effectively checked even by a democratically organized political society because under existing conditions, private capitalists inevitably control, directly or indirectly, the main sources of information.

Rejoice with your family in the beautiful land of life.

I cannot conceive of a God who rewards and punishes his creatures, or has a will of the type of which we are conscious in ourselves. An individual who should survive his physical death is also beyond my comprehension, nor do I wish it otherwise; such notions are for the fears or absurd egoism of feeble souls.

All our thinking is of this nature, a free play with concepts.

My internal and external life depend so much on the work of others that I must make an extreme effort to give as much as I receive.