Portrait of Ayn Rand - author of the quote: "“Logic is the art of non-contradictory identification. A con..."

"“Logic is the art of non-contradictory identification. A contradiction cannot exist. No concept man forms is valid unless he integrates it without contradiction into the total sum of his knowledge. To arrive at a contradiction is to confess an error in one’s thinking; to maintain a contradiction is to abdicate one’s mind and to evict oneself from the realm of reality”"

— Ayn Rand

Logic Is The Art Of Non Contradictory

“Logic is the art of non-contradictory identification. A contradiction cannot exist. No concept man forms is valid unless he integrates it without contradiction into the total sum of his knowledge. To arrive at a contradiction is to confess an error in one’s thinking; to maintain a contradiction is to abdicate one’s mind and to evict oneself from the realm of reality”

— Ayn Rand
truth
“You can recognize a small truth because its opposite is a falsehood. The opposite of a great truth is another truth.”
— Niels Bohr
“Thinking is man’s only basic virtue, from which all the others proceed. And his basic vice, the source of all his evils, is that nameless act which all of you practice, but struggle never to admit: the act of blanking out, the willful suspension of one’s consciousness, the refusal to think - not blindness, but the refusal to see; not ignorance, but the refusal to know. It is the act of unfocusing your mind and inducing an inner fog to escape the responsibility of judgment - on the unstated premise that a thing will not exist if only you refuse to identify it, that A will not be A so long as you do not pronounce the verdict ‘It is.”
— Ayn Rand
“The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.”
— Niels Bohr
“Truth at last cannot be hidden. Dissimulation is of no avail. Dissimulation is to no purpose before so great a judge. Falsehood puts on a mask. Nothing is hidden under the sun.”
— Leonardo da Vinci
“There are trivial truths and there are great truths. The opposite of a trivial truth is plainly false. The opposite of a great truth is also true.”
— Niels Bohr
“Well, the way of paradoxes is the way of truth. To test reality we must see it on the tight rope. When the verities become acrobats, we can judge them.”
— Oscar Wilde