About 2 years ago, I made a vow that I would pray 5 decades of the Holy Rosary everyday, and so far, by God’s grace, I’ve been able to keep it for all this time, but yesterday, I prayed only 2 decades of the Rosary since I had to do something else, and I forgot throughout the day that I still had 3 decades left and went to bed and realized this morning I didn’t pray all 5 decades. I wrote down my vow on a piece of paper and put my fingerprint in wax on it, so is this a sin that I need to confess?
Thanks and God bless
It is likely you did not make a vow, you made a promise to God. At least as far as you have described it.
Can. 1191 §1. A vow, that is, a deliberate and free promise made to God about a possible and better good, must be fulfilled by reason of the virtue of religion.
You said what you promised to do, but you did not say why you promised it, ie “a possible and better good”. A vow must have an intent.
If there was a purpose to the vow, consider the following:
Can. 1194 A vow ceases by the lapse of the time designated to fulfill the obligation, by a substantial change of the matter promised, by the absence of a condition on which the vow depends, by the absence of the purpose of the vow, by dispensation, or by commutation.
In other words, if the purpose (condition) is now gone, so is the vow. For example, if I vow to pray a rosary everyday so that my son enters the priesthood: upon his ordination or marriage the vow is automatically not valid anymore.
In general, private vows should ONLY be made under the guidance of a priest or spiritual director. If you do make a private vow, not following it is certainly a sin.
Here is the Church’s set of laws consering vows:
vatican.va/archive/ENG1104/__P4E.HTM