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Whose famous saying is to review the past and learn the new?
Review the past and learn new things;

Only by reviewing what you have learned can you gain new insights from it.

So old: just (bearing) can: can: rely on: into.

In a threesome, there must be a teacher:

There are three people walking together. Someone must be my teacher.

Learn from time to time, let's say:

Isn't it a pleasure to practice what you have learned often?