What developers means

Keep a record of the little victories of each day - Dale Carnegie
At its core, this is about actively shifting your focus from what's going wrong to what's going right, no matter how small. It's the deliberate practice of collecting evidence of your own progress and competence.

Wise advice on developers

Relax while you work - Dale Carnegie
The core message is that high performance isn't born from stress and tension, but from a state of relaxed focus where you're fully engaged yet free from the corrosive effects of worry.

Wise advice on developers

Shut the iron doors on the past and the future, live in the present - Dale Carnegie
The core message is radical mental hygiene: deliberately and forcefully sealing off the mental energy drains of past regrets and future worries so you can invest that energy fully in the present.