Heaven is for the saved and Hell is for the unsaved.
More or less, the damned segment of humanity is to be told to depart into the “eternal fire prepared for the devil and his angels.” Evangelicals differ on the exact meaning here (especially in the fervent bible belt) but a commonly accepted reading is that hell had been prepared for Satan and his co-rebels before man had ever fallen. An abode for men lost in their sin was a later purpose for hell, not its initial purpose.
Heaven goes by favor.
If it went by merit, you would stay out and your dog would go in.
- Mark Twain, a Biography