Jerome : "In spite of all dreams, futility and idle chatter, rather: Fear God! "The Hebrews explain this passage in great detail, and in the following way: and you should not do the things detailed above, about which he has already spoken, lest you believe too readily in dreams. For when you see different things, your mind will be troubled by many fears throughout your night's rest, or aroused by promises, you despise those things that are dream-like. You should only fear God. For he, who believes in dreams, gives himself over to vanities and nonsense. Another meaning of this passage is, since I have said and admonished, "you should not let your mouth bring guilt on your flesh", and to seek this or that excuse; I introduce this now, since in the dream of that life, and in the appearance, shade, cloud in which we live, we are able to find many things, which seem true to life to us and excuse our sins. Therefore I advise that you beware that alone, lest you think God is absent, but fear Him, and know He is present in all your toil, and do not force yourself to be hidden in free will, but want whatever it is that you do. — Commentary on Ecclesiastes