Matthew Poole and continuators on Ecclesiastes 5:7

7 For in the multitude of dreams and many words, there are also divers vanities : but fear thou God .

There is a great deal of vanity and folly as in multitude of dreams which for the most part are vain & insignificant, so also in many words, i. e. in making many vows whereby a Man is exposed to many snares and temptations.

Fear the offence and wrath of God, and therefore be sparing in making Vows, and just in performing them. Whereby he implies that this rashness in vowing, and slackness in performing Vows proceeds from the want of a just reverence and dream of the Divine Majesty, who is immediately concerned in these matters.