Dialectic—General Forum
“The power of negative thinking is the driving power of dialectical thought.”
—Herbert Marcuse

Hegel Forum
CONTRADICTIO EST REGULA VERI
"Contradiction is the rule of the true."—G.W.F. Hegel

Quantum Mechanics
CONTRARIA SUNT COMPLEMENTA
"Opposites are complementary."—Niels Bohr

Critical Theory
"Thought as such is an act of negation."
—Theodor Adorno

Ancient Greek Dialectic
ὁ μὲν γὰρ συνοπτικὸς διαλεκτικός, ὁ δὲ μὴ οὔ.
"The comprehensive mind is always the dialectical."—Plato

Chinese Dialectics
道可道，非常道。名可名，非常名。(道德经 - Daodejing)
"The path that can be a path is not the eternal path. The name that can be named is not the eternal name."

Soviet Dialectics
"Contradiction as the concrete unity of mutually exclusive opposites is the real nucleus of dialectics."
—Evald Ilyenkov

Marx/Engels Forum
"Men thought dialectically long before they knew what dialectics was."
—Friedrich Engels

Dialectical Psychology
"Negativity is an essential part of human existence and change."
—Weeks & L'Abate