Daily question, July 29, 2026
Politics
The strong do what they can and the weak suffer what they must.
Source: Thucydides, History of the Peloponnesian War (Melian Dialogue)
A blunt statement of political realism, that justice between unequal powers may be decided by force rather than argument.
Mathematics
317 is a prime, not because we think so, or because our minds are shaped in one way rather than another, but because it is so, because mathematical reality is built that way.
Source: G. H. Hardy, A Mathematician's Apology
Hardy insisted mathematical facts are discovered, not invented; the whole realism versus formalism debate turns on whether this is right.
Physics
If I have seen further, it is by standing on the shoulders of giants.
Source: Isaac Newton, letter to Robert Hooke, 1675
Newton on how physics builds cumulatively; each theory of motion inherits and corrects the ones before it.
Psychology
Habit is the enormous fly-wheel of society, its most precious conservative agent.
Source: William James, The Principles of Psychology
James argued habit does the heavy lifting of a stable life; break one and see how much of daily behavior was never really chosen.
Philosophy
The unexamined life is not worth living.
Source: Socrates, in Plato's Apology
Socrates said it facing a death sentence for asking too many questions. Still the case against a life on autopilot.
Biology
Nothing in biology makes sense except in the light of evolution.
Source: Theodosius Dobzhansky, 1973
Written as a rebuke to teaching biology without evolution; the claim is that evolution is the field's organizing framework, not an optional unit.
