内心深处的英语是the cockles of the heart,也可以写作deep inside;deep down;in the deep;deep in one's heart.
影视原声:
I hope you're not lying, Leon. I really hope that deep down inside, there's no love in you. 里昂,我希望你说的是实话,我真的希望,在你内心深处对我没有一丝的爱。——《这个杀手不太冷》
例句:
他不再能分享她内心深处的想法。
He was no longer privy to her innermost thoughts.