Courage isn't the absence of fear, but the will to keep going.
Every life is in many days, day after day. We walk through ourselves, meeting robbers, ghosts, giants, old men, young men, wives, widows, brothers-in-love, but always meeting ourselves.
The most formidable weapon against errors of every kind is reason.
The only way to learn mathematics is to do mathematics.
If you’re not adapting, you’re falling behind—complacency has no place in business.