My mantra is: my mind is the club, I am the DJ [and] my choices affect the atmosphere -- so let's keep that atmosphere groovy.
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Risk means more things can happen than will happen. The practical definition of risk is not volatility or a standard deviation — it's the possibility of permanent loss of capital. Volatility is opportunity dressed in frightening clothes.
Howard Marks — The Most Important Thing: Uncommon Sense for the Thoughtful Investor
Intelligence is a conversion ratio, with an optimality bound. Increasing intelligence is not so much like "making the tower taller", it's more like "making the ball rounder". At some point it's already pretty damn spherical and any improvement is marginal.
Francois Chollet
The record of a money manager who merely stays close to the market is not an outstanding record—it is a record of someone who has successfully rationalized doing nothing. The question is not whether you beat the market, but whether you had the intellectual honesty to know when you had no edge and the discipline to act accordingly.
Seth Klarman — Margin of Safety: Risk-Averse Value Investing Strategies for the Thoughtful Investor