History is a guide to navigation in perilous times. History is who we are and why we are the way we are.

The health effects of air pollution imperil human lives. This fact is well-documented.

Enslave the liberty of but one human being and the liberties of the world are put in peril.

When even one American - who has done nothing wrong - is forced by fear to shut his mind and close his mouth - then all Americans are in peril.

We have not given science too big a place in our education but we have made a perilous mistake in giving it too great a preponderance in method in every other branch of study.

We were then in a dangerous helpless situation exposed daily to perils and death amongst savages and wild beasts not a white man in the country but ourselves.

Courage enlarges cowardice diminishes resources. In desperate straits the fears of the timid aggravate the dangers that imperil the brave.

Just as courage imperils life fear protects it.

To act coolly intelligently and prudently in perilous circumstances is the test of a man - and also a nation.

By far my most perilous assignment was covering a tank car explosion.