Whatever action, bodily, verbal or mental, leads to suffering for oneself, for others or for both, that action is bad (akusala). Whatever action, bodily, verbal or mental, does not lead to suffering for oneself, for others or for both, that action is good (kusala)

And as soon as he saw her, he tore his clothes and said, Alas, my daughter! You have brought me very low, and you have become the cause of great trouble to me. For I have opened my mouth to the lord, and I cannot take back my vow

Blessed is He in Whose Hand is the kingdom, and He is Able to do all things. The One Who has created death and life in order to test you and see which of you is best in deed, and He is the All-Mighty, the Oft-Forgiving.

It is a blessing in disguise.

That the trial of your faith, being much more precious than of gold that perisheth, though it be tried with fire, might be found unto praise and honor and glory at the appearing of Jesus Christ:

Not to commit any sin, to do good, and to purify one's mind, that is the teaching of (all) the Awakened.