"I think, I'll be there!"

This expression is by René Descartes, a French philosopher and mathematician who lived between 1596 and 1650, considered by many to be the founder of modern philosophy and one of the main exponents of the Enlightenment, a movement that defended individual freedoms and the use of reason as the basis of knowledge.

Despite all the mathematics that had been studied, Descartes began to doubt everything around him, even of his own existence. Until you came to a conclusion: if I’m doubting it’s because I’m thinking and if I’m thinking, obviously I’m existing. A logical reasoning that led
him to the famous expression that opens this text and that became one of the symbols of the Enlightenment movement.

To think is therefore an axiom of human existence itself. It is through thought that we have ideas, we create expectations, ask questions, we create answers and find solutions to the most diverse problems that happen during life. 

But what if we think of something and it bothers us or do we feel that it is something that does not leave us (or possibly not let us) happy?

Where should we be guided by reason or emotion? Are they mutually exclusive or can we reconcile them?

In advance, one of the beauties of thought is that anyone can be modified or replaced (even immediately) by another, even if antagonistic, based on our beliefs and knowledge on each subject or in the face of the mental validation of arguments elaborated by third-party thoughts.

Then we come to an interesting point that is the ultimate goal of this text. How do we establish a psychological contract with other people through our thoughts?