To know is one thing, and to teach is another.
(아는 것과 가르치는 것은 별개의 것이다.)
To know is one thing, and to practice is another.
It is one thing to own a library; it is quite another to use it wisely.
Saying is one thing and doing another.
To know English is one thing, and to speak English is another.
A learned man is not always a good teacher, for to know much is one thing, and to teach well is another.
Going hiking is one thing, and climbing the mountain is another.
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