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Truth is what stands the test of experience.
Events in the past may be roughly divided into those which probably never happened and those which do not matter.
The public will believe anything, so long as it is not founded on truth.
As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.
Never let the future disturb you. You will meet it, if you have to, with the same weapons of reason which today arm you against the present.
All truths are easy to understand once they are discovered; the point is to discover them.
The future is an opaque mirror. Anyone who tries to look into it sees nothing but the dim outlines of an old and worried face.
It's easier to walk downhill, but the best view is at the top.
Great spirits have always found violent opposition from mediocrities.
You cannot simultaneously prevent and prepare for war.
Imagination is more important than knowledge.
We can draw lessons from the past, but we cannot live in it.
Truth is the only safe ground to stand on.
I don't think of the past. The only thing that matters is the everlasting present.
A man travels the world over in search of what he needs and returns home to find it.
I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
The best way to predict the future is to invent it.
Certainly, travel is more than the seeing of sights; it is a change that goes on, deep and permanent, in the ideas of living.
I never think of the future - it comes soon enough.
Truth is generally the best vindication against slander.
All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident.
Time is the coin of your life. It is the only coin you have, and only you can determine how it will be spent. Be careful lest you let other people spend it for you.
Before he sets out, the traveler must possess fixed interests and facilities to be served by travel.