51 As you enter the house of God, keep your ears open and your mouth shut. It is evil to make mindless offerings to God. 2 Don't make rash promises, and don't be hasty in bringing matters before God. After all, God is in heaven, and you are here on earth. So let your words be few. 3 Too much activity gives you restless dreams; too many words make you a fool.
4 When you make a promise to God, don't delay in following through, for God takes no pleasure in fools. Keep all the promises you make to him. 5 It is better to say nothing than to make a promise and not keep it. 6 Don't let your mouth make you sin. And don't defend yourself by telling the Temple messenger that the promise you made was a mistake. That would make God angry, and he might wipe out everything you have achieved.
Matthew Henry's Commentary on Ecclesiastes 5:1-6
Commentary on Ecclesiastes 5:1-3
(Read Ecclesiastes 5:1-3)
Address thyself to the worship of God, and take time to compose thyself for it. Keep thy thoughts from roving and wandering: keep thy affections from running out toward wrong objects. We should avoid vain repetitions; copious prayers are not here condemned, but those that are unmeaning. How often our wandering thoughts render attendance on Divine ordinances little better than the sacrifice of fools! Many words and hasty ones, used in prayer, show folly in the heart, low thoughts of God, and careless thoughts of our own souls.
Commentary on Ecclesiastes 5:4-8
(Read Ecclesiastes 5:4-8)
When a person made engagements rashly, he suffered his mouth to cause his flesh to sin. The case supposes a man coming to the priest, and pretending that his vow was made rashly, and that it would be wrong to fulfil it. Such mockery of God would bring the Divine displeasure, which might blast what was thus unduly kept. We are to keep down the fear of man. Set God before thee; then, if thou seest the oppression of the poor, thou wilt not find fault with Divine Providence; nor think the worse of the institution of magistracy, when thou seest the ends of it thus perverted; nor of religion, when thou seest it will not secure men from suffering wrong. But though oppressors may be secure, God will reckon for all.