A rather ancient statement:
Time washes away the fancies of imagination but confirms the judgments of nature.
Cicero, The Nature of the Gods
One that needs some context:
The lady says to her would-be lover, �Who secheth sorowe, his be the receyt!�
(From La Belle Dame Sans Merci, translated by Sir Richard Ros from Alain Chartier�s original)
A quite pithy comment from an often long-winded fellow:
Every reform, however necessary, will by weak minds be carried to an excess that itself will need reforming.
(Samuel Taylor Coleridge, Biographia Literaria)
Two from The Treasury of David:
Common honesty is no longer common, when common irreligion leads to universal godlessness.
…we cannot master our affections by love, but first we must master our understandings by faith. �Richard Capel
One that has been often verified by experience:
And ever has it been that love knows not its own depth until the hour of separation.
Kahlil Gibran, The Prophet
One recycled from previous posting:
…ingratitude is like an abyss which absorbs all the fullness of God�s blessings.
John Calvin, Commentary on Lamentations (1:7)
And another slice from ancient Rome to finely close off this miscellany of maxims:
God is not subject to obey the laws of nature. It is nature that is subject to the laws of God.
Cicero, The Nature of the Gods