Important principles may, and must, be inflexible.
Let us with caution indulge the supposition that morality can be maintained without religion. Reason and experience both forbid us to expect that national morality can prevail in exclusion of religious principle.
Galileo was no idiot. Only an idiot could believe that science requires martyrdom - that may be necessary in religion, but in time a scientific result will establish itself.
Violence can only be concealed by a lie, and the lie can only be maintained by violence. Any man who has once proclaimed violence as his method is inevitably forced to take the lie as his principle.
Great ambition is the passion of a great character. Those endowed with it may perform very good or very bad acts. All depends on the principles which direct them.
Play not with paradoxes. That caustic which you handle in order to scorch others may happen to sear your own fingers and make them dead to the quality of things.
The sons of Judah have to choose that God may again choose them. The divine principle of our race is action, choice, resolved memory.
You can't deny laughter; when it comes, it plops down in your favorite chair and stays as long as it wants.
I love the look of planes and the idea of how a plane flies. The more I learn about it the better I feel; while I still may not like it, I have a sense of what is really happening.
There is in my opinion a great similarity between the problems provided by the mysterious behavior of the atom and those provided by the present economic paradoxes confronting the world.
To know that everything we say and do to this new little human being may have a profound effect on him or her is a daunting obligation.
The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when it be obeyed.
The darkest places in hell are reserved for those who maintain their neutrality in times of moral crisis.
Don't interfere with anything in the Constitution. That must be maintained, for it is the only safeguard of our liberties.
In this outward and physical ceremony we attest once again to the inner and spiritual strength of our Nation. As my high school teacher, Miss Julia Coleman, used to say: 'We must adjust to changing times and still hold to unchanging principles.'
Science is analytical, descriptive, informative. Man does not live by bread alone, but by science he attempts to do so. Hence the deadliness of all that is purely scientific.
A rule of thumb for a warrior is that he makes his decisions so carefully that nothing that may happen as a result of them can surprise him, much less drain his power.
I know not how I may seem to others, but to myself I am but a small child wandering upon the vast shores of knowledge, every now and then finding a small bright pebble to content myself with.
It is just that we should be grateful, not only to those with whose views we may agree, but also to those who have expressed more superficial views; for these also contributed something, by developing before us the powers of thought.
By ethical argument and moral principle the greatest crimes are eventually shown to have been necessary, and, in fact, a benefit to mankind.
Great acting may be a turn-on, but it won't make me fantasize about the person for a week.
Violence can only be concealed by a lie, and the lie can only be maintained by violence.
If I am not, may God put me there; and if I am, may God so keep me.
To lose one parent may be regarded as a misfortune; to lose both looks like carelessness.
I shall never be a heretic; I may err in dispute, but I do not wish to decide anything finally; on the other hand, I am not bound by the opinions of men.