History is the key to everything: politics, religion, even fashion.

The line argues that historical awareness is not a niche academic pursuit but a master tool for understanding human life. By listing politics and religion—domains shaped by long memory, institutions, and inherited conflicts—and then adding “even fashion,” it suggests that trends and tastes also emerge from past events, cultural exchanges, and recurring cycles of imitation and reaction. The quote implies that what looks new is often a reworking of older ideas, and that interpreting the present responsibly requires tracing its roots. It’s a compact defense of historical thinking as a way to decode motives, symbols, and power across society.