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*