And anyone whose name was not found recorded in the Book of Life was thrown into the lake of fire. (Revelation 20:15 NLT)
You can travel around the states and you'll probably find a place to stay, even if you didn't have a reservation in advance. However, traveling to Heaven is different! Only those whose names are recorded in "the Book of Life" will gain entrance to God's city, let alone find an eternal resting place there. Failing to plan ahead for this journey has severe consequences!