Please tell me the origin and meaning of the following slogan! ! The teacher wants it tomorrow! Urgent! Urgent! !

I know that the fourth movement of heaven is strong and vigorous. A gentleman keeps the earth strong by self-improvement. A gentleman carries things with kindness.

The two sentences mean: the movement of heaven (i.e. nature) is strong and strong. , Correspondingly, a gentleman's behavior in the world should be like the sky, striving for self-improvement, being resolute, determined, and never stopping; the momentum of the earth is thick and gentle, and a gentleman should increase his virtues and accommodate all things.

From "The Book of Changes"

The second one has an impression, wait for me to check it out