Generally attributed to Henry David Thoreau.
We would often be sorry if our wishes were gratified.aesop
Wisdom makes but a slow defence against trouble, though at last a sure one.Oliver Goldsmith
If one does not know to which port one is sailing, no wind is favorable.Lucius Annaeus Seneca
Once a king or queen of Narnia, always a king or queen of Narnia. May your wisdom grace us until the stars rain down from the heavens.C. S. Lewis
Knowing others is wisdom; knowing the self is enlightenment.Lao Tzu