The below quote, although misattributed to Sun Tzu, still remains one of my favourites in thinking about trading.

"Strategy without tactics is the slowest route to victory. Tactics without strategy is the noise before defeat."

Chance and chance alone has a message for us. Everything that occurs out of necessity, everything expected, repeated day in and day out, is mute. Only chance can speak to us. We read its message much as gypsies read the images made by coffee grounds at the bottom of a cup. --Milan Kundera

Repeticio est mater studiorum.

(Repetition is the mother of all learning)

--Thomas Aquinas

A forest is long in growing, but its ashes are made in a moment. --Seneca

Most [quant] failures occur becuase of regime changes. Value works. Growth works. Momemntum works. Quality works. They just don't work all at the same time. -- Cam Hui

No asset or strategy is so good that you should invest irrespective of the price paid. --James Montier

Don’t hate the asset, hate the price! --Joshua Brown

A $100k account does you no good if you can't stand to lose $100.

Without risk under control, it will be very hard to survive your learning cuve.

A loss taken quickly brings you closer to a trade that works.

--FuturesTrader71, Morad Askar

"If you're right at the wrong time, you're wrong" - Yra Harris

If you want to become good at something, teach others how to do it. The former doesn’t have to precede the latter. Teaching is learning. --Sean McCabe