Constanter et non trepide.
It is not knowledge, but the act of learning, not possession but the act of getting there, which grants the greatest enjoyment. When I have clarified and exhausted a subject, then I turn away from it, in order to go into darkness again; the never-satisfied man is so strange if he has completed a structure, then it is not in order to dwell in it peacefully, but in order to begin another. I imagine the world conqueror must feel thus, who, after one kingdom is scarcely conquered, stretches out his arms for others. — J. C. F. Gauß (Letter to Farkas (Wolfgang) Bolyai, 1808)
Dimidium facti, qui coepit, habet: sapere aude, incipe — Quintus Horatius Flaccus (Epistulæ I, ii, 40)
Historia vero testis temporum, lux veritatis, vita memoriæ, magistra vitæ, nuntia vetustatis — Marcus Tullius Cicĕro (De Oratore II, ix, 36)