How can I possibly know?

From the post Five Final Thoughts on “Love Wins” (and then I’m finished) | Shawn Smucker

When Jesus died on the cross, two thieves died beside him. If I would have been a follower of Jesus on that day, it would have been easy for me to look at those thieves and think, “Those evil men are going straight to hell.” But what would have been unknown to me was the fact that one of those thieves looked at Jesus and said “Remember me!” Simply that. No Roman Road. No prayer of salvation. Did he even know Jesus’s name? We’ll never know. But he asked Jesus to remember him, and Jesus said he would join him in paradise that very day.

Who am I to make a judgment call on whether that person of another faith did or did not go to heaven? How can I possibly know?