"Whatever a foe may do to a foe, or a hater to a hater, a wrongly directed mind will do us greater mischief."

"There are only two mistakes one can make along the road to truth; not going all the way, and not starting."

"If the problem can be solved, why worry? If the problem cannot be solved, worrying will do you no good."

"Nothing can harm you as much as your own thoughts unguarded."

"Just as a solid rock is not shaken by the storm, even so the wise are not affected by praise or blame."