with all heart

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with all one's heart (and soul)

Cliché very sincerely. Oh, Bill, I love you with all my heart and soul, and I always will! She thanked us with all her heart and soul for the gift.
See also: all, heart

with all (one's) heart

1. With great willingness or pleasure.
2. With the deepest feeling or devotion.
See also: all, heart