expression
repeated reading makes the meaning clear; read a difficult book a hundred times
Proverb encouraging perseverance in reading; meaning will naturally emerge through repeated effort.
読書百遍意自ずから通ずというから、難しい本も諦めずに何度も読んでみよう。
They say repeated reading makes the meaning clear, so let's read this difficult book many times without giving up.
A classical Chinese-derived proverb (from the Three Kingdoms period scholar Dong Yu). The exact historical derivation is uncertain, but it has been used in Japanese as a set phrase for centuries.