Martyrdom, as a rule, establishes the sincerity of the martyr, never the correctness of his thought. Things are true or false in themselves.

At thirty most men have prejudices rather than opinions-that is to say, rather than judgments-and few men have lived to be sixty without materially modifying the opinions they held at thirty.

Ignorance is the soil in which belief in miracles grows.

Memory is the miser of the mind; forgetfulness the spendthrift.

All religious systems enslave the mind. Certain things are demanded-certain things must be believed-certain things must be done-and the man who becomes the subject or servant of this superstition must give up all idea of indivuality or hope of intellectual growth or progress.

I love to think of the whole universe together as one eternal fact. I love to think that everything is alive; that crystallization is itself a step toward joy. I love to think that when a bud bursts into blossom: it feels a thrill. I love to have the universe full of feeling and full of joy, and not full of simple dead, inert matter, managed by an old bachelor for all eternity.

When a fact can be demonstrated, force is unnecessary; when it cannot be demonstrated, force is infamous.