Ben Graham’s Mental Toolkit

1. Objective Evidence – Operations for profit should be based not on optimism but on arithmetic.
2. Independent & Skeptical Outlook – Take nothing on faith. Be skeptical about your own beliefs.
3. Serene Imperturbability – Stay calm & keep your head when others are losing theirs.
4. Patience & Discipline – Stick to your convictions. Have courage of knowledge & experience.

courtesy of a tweet by Vishal Khandelwa