The test of a first-rate intelligence is the ability to hold... - Alfred Adler

"The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time and still retain the ability to function."

Alfred Adler Knowledge

Psychologist Austrian 1870–1937

More from Alfred Adler

"Courage is not the absence of fear, but rather assessment that something else is more important than fear."

"The greatest invention is imagination."

"We are not determined by our heredity and environment; we make ourselves."

"Everybody can be significant, because everybody can serve."

"We're not just after treasure. We're preserving history."

"The mind is humanity's greatest tool."

"A tidy room reflects a tidy mind."

"You can learn a lot about a person by how they keep their space."