I realized I had been keeping people around even when deep down I knew they were bad for me. I had overridden myself.

Deep down, I'm pretty superficial.

Deep down, there is in the substance of the cosmos a primordial disposition, sui generis, for self-arrangement and self-involution.

Deep down, I happen to be very shallow.

I fantasize and idealize myself as Bugs Bunny, but I know deep down I'm Daffy Duck.

I always had, deep down, a slight aversion toward the purely cerebral in music.