Sublime

Technique 8: Connect With Quid Pro Quo Sometimes you have to give to get. Quid pro quo refers to the art of giving a little information about yourself to get a little from others. Out of all of the techniques, this one is the most subtle and if all of the others techniques are working effectively, might not be used at all.

Robin K. Dreeke • It's Not All About "Me": The Top Ten Techniques for Building Quick Rapport with Anyone

Habit is essentially inertia, the strong tendency to keep doing what you have been doing (or not doing what you have not been doing).

Ray Dalio • Principles: Life and Work

The wish to acquire is in truth very natural and common, and men always do so when they can, and for this they will be praised not blamed; but when they cannot do so, yet wish to do so by any means, then there is folly and blame.

Niccolò Machiavelli • The Prince

if your judgements are right, you’ll do well, but if they’re wrong, you’ll do badly; for whatever a person does, he does on the basis of a judgement.

Epictetus • Discourses, Fragments, Handbook (Oxford World's Classics)

To know what people really think, pay attention to what they do, rather than what they say.

Descartes