With "say a thousand songs to know the sound, look at a thousand swords to know the instrument", the motto with similar meaning is as follows:

Read it a thousand times and you will understand what you mean.

Reading breaks thousands of volumes, and writing is like a god.

I am familiar with 300 Tang poems, and I will steal them if I can't recite them.

The old horse knows the way.

A long illness makes a good doctor.