Ben Sira 8:18

18 Do no secret thing before a stranger; for thou knowest not what he will bring forth.

Ben Sira 8:18 In-Context

16 Strive not with an angry man, and go not with him into a solitary place: for blood is as nothing in his sight, and where there is no help, he will overthrow thee.

17 Consult not with a fool; for he cannot keep counsel.

18 Do no secret thing before a stranger; for thou knowest not what he will bring forth.

19 Open not thine heart to every man, lest he requite thee with a shrewd turn.