When giving someone a present or doing a favour for someone, the kindness behind the act is more important than any other consideration.

Used as a polite reply after being thanked

Polite reaction after receiving thanks.

(often ironic, sarcastic) Don't blame yourself for the end of our relationship.

In order to save water, do not flush the toilet every time you urinate.

In order to save water, only flush the toilet after defecation, not after urination.

Alternative form of it's an ill wind that blows nobody any good

(US) If somebody is ranting or complaining about something, they were probably hurt by it.

The situation is too complicated or extensive to talk about. / The situation is too embarrassing to talk about.

When it comes to sexual satisfaction, penis size doesn't matter, but technique does. / (more generally) The tools you use to accomplish a goal are not as important as what you do with them.