That power is in vain which is never in use.
None can do a man so much harm as he doeth himself.
It is impossible for a man to be made happy by putting him in a happy place, unless he be first in a happy state.
None are known to be good, till they have opportunity to be bad.
The most that any of us know, is the least of that which is to be known.
Man is a wonder to himself; he can neither govern nor know himself.