The reason it is hard for us to think of the doctrine of hell is because God has put in our hearts a portion of His own love for people created in His image, even His love for sinners who rebel against Him.
As long as we are in this life, and as long as we see and think about others who need to hear the gospel and trust in Christ for salvation, it should cause us great distress and agony of spirit to think about eternal punishment.
Question for Reflection
- Do you think of the eternal destiny of unbelievers?
Resources
Wayne Grudem, Systematic Theology, 1152.
Christianity Matters 
can’t imagine being so indifferent to another knowing God’s love that I wouldn’t want to share his love with them
Yeah, I think you are right. We shouldn’t be indifferent. We should realize those who don’t believe are going to hell, which should motivate us to spread the gospel.
Thanks for reading and commenting.