A Christian is one who ought to say what they mean and mean what they say. They are to keep the commitments that they make. The Lord said for your yes to be yes and your no to be no.
Matthew 5:37 But let your statement be, ‘Yes, yes’ or ‘No, no’; anything beyond these is of evil.
Sometimes you might make a commitment and then change your mind. Maybe something more appealing has come up. You need to keep the original commitment that you made.
Psalm 15:4b He swears to his own hurt and does not change;
However, if you are in a situation where you have become ensnared by the words of your mouth and you can get out then do so, if you realize right afterwards that you have made a mistake.
Proverbs 6:2-5 If you have been snared with the words of your mouth,
Have been caught with the words of your mouth,
Do this then, my son, and deliver yourself;
Since you have come into the hand of your neighbor,
Go, humble yourself, and importune your neighbor.
Give no sleep to your eyes,
Nor slumber to your eyelids;
Deliver yourself like a gazelle from the hunter’s hand
And like a bird from the hand of the fowler.
In everything that you do ask yourself, “Is it loving and is it true?” Be faithful to your words and learn to not commit yourself to things that you can not fulfill. If you get your self in a mess then go to your earthly authority and ask for help. Usually if you try to “fix” something then you make a bigger mess. Ask the Lord for wisdom.
James 1:5 But if any of you lacks wisdom, let him ask of God, who gives to all generously and without reproach, and it will be given to him.
“Without reproach” means that He does not say “I told you so” or “You should have come to Me in the first place”. No, it means that He is waiting to help you but is waiting for you to ask Him for help and for wisdom. He wants to teach you His ways. Humility is admitting that you need help.
Psalm 25:8,9 Good and upright is the Lord;
Therefore He instructs sinners in the way.
He leads the humble in justice,
And He teaches the humble His way.
To sum up, He wants you to keep your words and wants you to be faithful to your commitments. If you make a mistake or over commit and can go and humble yourself and get out then do so. If you can’t then go to your authority and ask for help. Ask the Lord for wisdom. You will find that if you don’t run from your responsibilities then you will mature through them. If you learn to be faithful to your commitments then you will also learn to not over commit. Know that for every word you have spoken you will have to give an account to the Lord.