Carl Sagan Quote

Skepticism is the chastity of the intellect, and it is shameful to surrender it too soon or to the first comer; there is nobility in preserving it coolly and proudly through long youth, until at last, in the ripeness of instinct and discretion, it can be safely exchanged for fidelity and happiness.

Chapter 14 (p. 231, quoting George Santayana) - Contact (1985)