An investment in knowledge ...

An investment in knowledge pays the best interest.
An investment in knowledge pays the best interest.

More phrases

If one does not know to which port one is sailing, no wind is favorable.
What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.
We are masters of the unsaid words, but slaves of those we let slip out.
I have always found that mercy bears richer fruits than strict justice.
A lie gets halfway around the world before the truth has a chance to get its pants on.

Quotes from the same author

One today is worth two tomorrows.
The doorstep to the temple of wisdom is a knowledge of our own ignorance.
Watch the little things; a small leak will sink a great ship.
Honesty is the best policy.
Dost thou love life? Then do not squander time, for that is the stuff life is made of.