Ben Sira 34:4

4 Of an unclean thing what can be cleansed? and from that thing which is false what truth can come?

Ben Sira 34:4 In-Context

2 Whoso regardeth dreams is like him that catcheth at a shadow, and followeth after the wind.

3 The vision of dreams is the resemblance of one thing to another, even as the likeness of a face to a face.

4 Of an unclean thing what can be cleansed? and from that thing which is false what truth can come?

5 Divinations, and soothsayings, and dreams, are vain: and the heart fancieth, as a woman's heart in travail.

6 If they be not sent from the most High in thy visitation, set not thy heart upon them.