heart and soul Synonyms

gist heart substance body and soul essence kernel marrow meat core nub pith center utterly totally wholly thoroughly with all one's heart unconditionally wholeheartedly from the bottom of one's heart from beginning to end fervently every inch enthusiastically from A to Z nitty-gritty sum heartily sincerely altogether centre completely crux devoutly earnestly entirely essentiality extensively fully inwardness comprehensively perfectly really absolutely