the tragedy of Macbeth

Banquo says that the, The instruments of darkness tell us truths,. Win us with honest trifles, to betray 's. In deepest consequence. This means that people who serve evil, like the witches, will win people over with false promises but will always betray that person in the end. Bonquo is basically telling Macbeth not to trust the witches no matter what they say.