What does Macbeth say that demonstrates or shows his true nature?

*direct quote please*

The way he acted upon learning that he would be the next king, which led him to commit the corruptible facts to achieve his mission.

Explanation:

In Shakespeare's play, Macbeth, you can see how Macbeth changes after the witches tell her she will be thane of Cawdor and then king. When Macbeth saw that the first prophecy was fulfilled and was chosen thane de Cawdor, he understood that he must do something so that his position as king would not fall into the hands of others.

Here you can see how the true form of someone comes to light according to the situations that arise. Macbeth became a corrupt being and did not mind removing others to achieve his goal, which shows that human beings by nature are corruptible. People have good qualities and others not so favorable, but morality and ethics allow that in many cases they do not reach the point of governing their thoughts and act incorrectly, in the case of Macbeth it was different. Macbeth let his nature get in the way of everything he once thought was right to accomplish his mission.