Economic growth may one day turn out to be a curse rather than a good, and under no conditions can it either lead into freedom or constitute a proof for its existence.
Do not consider it proof just because it is written in books, for a liar who will deceive with his tongue will not hesitate to do the same with his pen.
Greatness is a spiritual condition worthy to excite love, interest, and admiration; and the outward proof of possessing greatness is that we excite love, interest and admiration.
Everybody believes in psychiatry; it’s supposed to be for our own good. Let psychiatry prove that anybody has an illness, and I’d concede, but there is no physical proof.
Refusal to believe until proof is given is a rational position; denial of all outside of our own limited experience is absurd.
To cease to admire is a proof of deterioration.
Consciousness of myself, combined with complete ignorance of everything that does not fall within my sphere of thinking, is the most telling proof of my substantiality outside God, of my original existence.
The insatiable thirst for everything which lies beyond, and which life reveals, is the most living proof of our immortality.
Finally there are simple ideas of which no definition can be given; there are also axioms or postulates, or in a word primary principles, which cannot be proved and have no need of proof.
The Phoenicians are entitled to be commemorated in history by the side of the Hellenic and Latin nations; but their case affords a fresh proof, and perhaps the strongest proof of all, that the development of national energies in antiquity was of a one-sided character.