heart and soul
with heart and soul
Eager love; strong feeling; great enthusiasm. Often used with a singular verb.
When Mr. Pitt plays the piano, his heart and soul is in it.
John plays tennis badly, but with heart and soul.
Mary wanted a puppy with all her heart and soul.
Wholly and eagerly; with all one's interest and strength; completely.
Will you try to make our city a better place? Then we are with you heart and soul.
Mike was heart and soul against the new rules.