The theory is gray, but what does the tree of life mean?

1, which is a well-known saying. German poet Goethe's poetic drama Faust. It's a sentence from the devil Mephistopheles in the play. The original words are: "Dear friends, all theories are gray, but the tree of life is evergreen."

However, some people often use only half of it, or "the theory is gray" or "the tree of life is evergreen", which is inevitably biased.

2. The article "On Strategy Book" wrote: "Now we must understand an indisputable truth, that is, Marxists must consider vivid real life and the exact facts of reality, and should not cling to yesterday's theory, because this theory, like any theory, can only point out basic and general things at most and can only summarize the complex situations in real life. My friend, the theory is gray, but the tree of life is evergreen. "Lenin's understanding is very comprehensive and correct.

We must consider the exact facts of reality, instead of clinging to yesterday's theory, because this theory, like any theory, can only point out basic and general things at most and can only summarize the complex situation in real life.