I'm very happy about it. Before pitching, I think it's a thing of the past. How to understand it?

I'm glad that it's a thing of the past between pitches;

What was once cheerful suddenly turned into the past.

Understanding this sentence should be put in context. What I said before was, "Although we choose different things, our quietness and urgency are different. When we are happy with what we encounter, we will gain something from ourselves for a while, and we will soon become self-sufficient, and we will never know when we are old. What he is tired of is that his feelings are advancing with the times and his feelings are embarrassing. "

Although people's hobbies are different, some are active and some don't like to talk, when they are happy with what they are exposed to, they will be complacent, happy and complacent for a while, but they forget that time has passed and aging will eventually come. When they are tired of what they love, their mood will change with the change of environment, and their feelings will arise spontaneously. What was once cheerful suddenly turned into the past. (That is to say, people's emotions are affected by the external environment, which changes rapidly and greatly)

The following is: the situation is short and short, and it is over. The ancients said, "Life and death are great." Doesn't it hurt?

Then the above understanding: Besides, the length of life is determined by nature, no matter how long it is, it will eventually die. The ancients said: "Life and death are also important!" How can you not be sad?

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So what this sentence means here is that people's likes and dislikes are deeply influenced by the outside world, but they are really insignificant in the face of globalization.