Truth is aletheia. A-letheia is the un-concealment that arises through un-forgetting. […] To un-forget the origin is to remember that one has forgotten and to recognize that such forgetting is inescapable. […] The truth "known" in the un-forgetting of a-letheia is a truth that always carries a shadow in the midst of its lighting.
Source: wiktionary
Her [Assia Djebar's] novelistic ‘un-forgetting’ of an occulted past and her confrontation with a perilous national present take her as far back as the fall of Carthage and forward through two millennia of subterranean linguistic and gender memories.
Source: wiktionary
Breaking open the word of God in Scripture through preaching is a vital way of un-forgetting. […] Whether in great set-piece sermons or in short intimate homilies the preacher is called upon to help us ‘un-forget’ the one thing that most people find it hardest to believe – that God loves them.
Source: wiktionary