To be happy with one's situation and accept what fate brings; to follow the will of heaven and be at peace with one's circumstances.

The age of fifty; based on the Confucian saying that by fifty one knows the mandates of heaven

A wise or broad-minded person is content with their lot in life and understands the will of Heaven; to be philosophical about one's destiny.

to stand in awe of the heavens and submit to one's destiny; to act in accordance with the will of heaven

To know and be submissive to one's fate, and to be content with one's position in life.