He can see through our frivolousness. It is better not to vow than to make a vow and not fulfill it. Much dreaming and many words are meaningless. God, in His Law, does not require His people to make vows. But if you refrain from making a vow, you will not be guilty.
Many people make vows when they are in dire straits, or undergoing extreme trials.
This is an improper use of vows. By making a vow in such a situation, they are implying that God needs to be paid in order to answer prayers. Thus, they are misunderstanding and misrepresenting the love of God, and the care that He has for His people. Under no circumstances should you make a vow to God that you cannot or will not carry out. Unfulfilled vows are detrimental to one s spiritual growth, as well as being unlawful.