What does this ancient prose mean?

Whether you succeed or fail, whether you are promoted or moved, there is a reason (according to what you have done)

When dealing with people, don't stick to appearances, gain a bosom friend, and forget to perfunctory and deceive these appearances.

To be a man, you must be true-minded, bold and heroic, and you must be able to afford and let go (drinking is what bold and broad-minded people do)

The last sentence "The whole people are proud of Chang 'an" has a double meaning, not just what you understand on the surface. You will be proud of the spring breeze.

On the other hand, you may be the one who gets the truth. Here, it may be the truth of failure.

Generally speaking. Whether you succeed or fail, you will learn from your experience. This is the source of your pride "meaning", invincible ... action is the most important thing.