Madhvaon Brahma Sūtra 3.2.4

Notwithstanding the absence of any other material and means, the Lord shows the things of dream as indicative of good or evil. The Sruti says, “ When a man, engaged in works (vows) undertaken for accomplishing particular wishes sees in his dreams a woman, he may infer success in that undertaking, when such a dream indication is seen,” (Ch. V. 2 9), and so on. “ By the word ‘ indeed * is indicated that there is the actual experience and obser- vation of the dream visions proving to be true (signs)/’ Further Vyasa and other sages who know the truth of dreams also say, “ Whatever a Brahmin or a God, a bull or a king may tell a person in dreams, will doubtless prove true.”