多多益善
The more the better.
All is fish that comes to his net.
All's grist that comes to the mill.

eg：Your donation, the more the better, helps the poor children to attend schools.

中英俚语俗语来源：史记·淮阴侯传：“上问曰，如我能将几何，信曰，不过十万，上曰，于君何如，曰，臣多多益善耳。”