Some that are not specifically programming quotes but are applicable:

> The fool wonders, the wise man asks.

— Benjamin Disraeli

> As a general rule, the most successful man in life is the man who has the best information.

— Benjamin Disraeli

> Plans are worthless, but planning is everything.

— Dwight D. Eisenhower

> Education: that which reveals to the wise, and conceals from the stupid, the vast limits of their knowledge.

— Mark Twain