欲速則不達. 英文?

欲速則不達
More haste, less speed

Meaning:
The faster you try to do something, the more likely you are to make mistakes that make you take longer than it would had you planned it.

http://www.usingenglish.com/reference/idioms/more+haste,+less+speed.html


學如逆水行舟，不進則退。
"Learning is like rowing upstream; not to advance is to drop back."

http://www.quotegarden.com/learning.html

欲速則不達
Haste makes waste

不進則退
Not to advance is to go back