Help oneself

If you want to take a shower, help yourself to towels; they're in the linen closet.

Is it all right if I get some water? —Oh, of course, help yourself!

He said I could help myself to the chocolates.

He didn't even ask; he just helped himself to the special tea I was saving.

Hugh helped himself to bacon. "My dear fellow, she can think what she likes so long as she continues to grill bacon like this. Your wife is a treasure, James—a pearl amongst women; and you can tell her so with my love."

Sorry for eating all the chocolates - I couldn't help myself.

God helps those who help themselves.