not forgiving another
The Unforgivable Sin
https://www.worksofmacdonald.com/consuming-fire-daily-devotional/2016/2/3/it-shall-not-be-forgiven
Some people make tough choices and don't always put themselves first. Imagine having a child with complicated medical issues, but if you quit your job, you lose your insurance, or have no way to feed your family.
Things are never black and white.