Be vigilant; guard your mind against negative thoughts.
Eternal vigilance is the price of liberty.
He is most free from danger, who, even when safe, is on his guard.
There are no permanent changes because change itself is permanent. It behooves the industrialist to research and the investor to be vigilant.
There is a significant Latin proverb; to wit: Who will guard the guards?
There is nothing so much seduces reason from vigilance as the thought of passing life with an amiable woman in marriage.
They that are on their guard and appear ready to receive their adversaries, are in much less danger of being attacked than the supine, secure and negligent.