Be virtuous and constantly strive for self-improvement What does that mean?

Virtue, carrying things, talking about mentality; Self-improvement is about spirit.

This sentence comes from the Book of Changes, and a gentleman should constantly strive for self-improvement; The capacity of the earth is limited, so a gentleman must constantly cultivate his own virtue to undertake the world.

This sentence was originally used by Liang Qichao to inspire students in Tsinghua. Later, it was gradually written into the school rules and school motto.

Meaning: heaven (that is, nature) is just strong, accordingly, a gentleman should behave like heaven, strive for self-improvement, be resolute and firm, and never stop trying to be strong; The potential of the earth is thick and slippery, and the gentleman is tolerant. A gentleman should run like Tianyu, indomitable even if he is displaced; If you are a gentleman, the measurement of objects should be like the earth, and nothing can't be carried.

Later, the significance of simplification is that people should have a broad mind and do things with perseverance.