学无止境

xué wú zhǐ jìng

there is no end to learning

Character by character

学xué
learning

无wú
no

止zhǐ
stop

境jìng
boundary

学无止境，爷爷七十岁了还在学电脑。

You're never done learning: Grandpa is learning to use a computer at seventy.

Tone: positive (praise).

A classroom-wall motto.

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This idiom and thousands more are in Learn Chinese with Bao, with audio, pinyin and drills that make them stick.