What is the meaning of "there is no wind and no rain in the heart, and the great god entrusts Kun" and where does it come from?

Excerpted from Wang's Collection of Calligraphy Couplets.

Wind and rain represent hardships, emotional ups and downs, and various situations encountered in work and life.

Psychological source refers to people's basic psychological quality, mentality, and whether they are calm, positive, at a loss or afraid of negativity when facing problems.

The heroic spirit is as mighty as the sea, and it can contain all righteous rivers. Only if it can be big, can it advance and retreat, can it make the world full of vitality and achieve its career. The meaning of honesty refers to the scientific and correct methodology.