Who is more correct in their view?
A. A person who knows without a doubt they are 100% going to heaven.
B. A person who sometimes has doubts about it?
May seem like an obvious answer of A is the right choice as they are sure they know where they are going. But the bible does say many will stand before Him and He will say "Go away, I do not know you." This is why I feel person B is more correct. Many people sometimes have doubts or worries. It's normal.
But often I find people A to be "holier than thou", judgemental, self-righteous...etc. The kind of people that the bible says often are knocked down from their perch of being so sure of themselves. They often say they never screw up, brag about their works and how perfect they are in Christ. Never show humility...etc. Like "Well I have never done <insert sin>, you must not believe enough if you have issue sometimes!".
Admiteddly whatever the case I don't even know, only God does. But I'd rather sometimes question myself than pretend I am perfect. I never even pretend to be perfect. If someone needs reproof I openly admit my imperfections so they see I'm not just pointing out the speck in their eye while ignoring my log. To me this is the best way to help someone. Being perfect just puts up defenses and comes across as dangerous in my mind.