Disappointment or anger occurs when you feel treated unfairly by someone. In other words, this feeling comes from the arrogance of wanting to be in a high position.We have been driven to this earth after committing a great sin against God with arrogance in heaven.We must not forget that we are sinners and God have given us time to repent in this land. We are sinners who deserve to die.

Humility in the English word is derived from the Latin word "humus," which means "soil." Human beings are also derived from the Hebrew word "adama" meaning "soil." Adam (םדָאָ), the first human being, is also named after "המדא," which means "soil."
When God made Adam, the first man, he made the lowest being, soil, and put a living soul into it. This is because God hopes that the souls of angels who have committed treason to usurp God's throne for their arrogant sins will be reborn as humility by taking pride off in the soil, the lowest being in the earth.
If we put ourselves in a high position because we want to be treated well, we cannot return to heaven.Therefore, if we truly want to be saved, whenever we feel arrogant or disappointed, we ought to remind ourselves that we are sinners and make efforts to give thanks to God for granting us salvation.
Let us understand the will of God, who wants us to repent of our sins in a low place, completely like soil, which is an unfinished product belonging to the soil, and become humble children.