expression
innermost depths of one's heart
Refers to the deepest, most private feelings or thoughts; often used in emotional or introspective contexts.
彼の言葉は心の奥底に響いた。
His words resonated in the innermost depths of my heart.
心の奥底では、彼女はまだ彼を愛していた。
Deep down in her heart, she still loved him.