Bhagavatapurana 11.22.38

11.22.38

dhyāyan mano 'nu viṣayān dṛṣṭān vānuśrutān atha /
udyat sīdat karma-tantraṃ smṛtis tad anu śāmyati //

37. Being under the influence of Karma the mind contemplates the objects perceived by the senses or heard of through the Vedas, tries for them, is lost in them and then the memory or the faculty that connects the past and the present states, is gradually lost.