Tell me and I forget. Teach me and I remember. Involve me and I learn.

Xun Kuang, Chinees Confuciaanse wijsgeer.

不闻不若闻之, 闻之不若见之, 见之不若知之, 知之不若行之

Not having heard something is not as good as having heard it; having heard it is not as good as having seen it; having seen it is not as good as knowing it; knowing it is not as good as putting it into practice.