BANQUO: And oftentimes, to win us to our harm,
The instruments of darkness tell us truths,
Win us with honest trifles, to betray ’s
In deepest consequence.

William Shakespeare (1564-1616) English dramatist and poet

Macbeth, Act 1, sc. 3, l. 135ff (1.3.135-138) (1606)
    (Source)

Speaking to Macbeth of the Weïrd Sisters (witches).