That's right. The wisest person is living in this world, preparing for his afterlife. The Bible said that everyone will be judged by God after they die. God gave human beings the opportunity to repent their sins and to prepare for Heaven. We, who learned the way to live wisely earlier, should let people know and plan for Heaven. I give eternal thanks and honor to Elohim God for letting me prepare for the Kingdom of Heaven.

If there was no bible, then it is true that we have to think how to live well in this earth. But bible is fact and also bible tells us the world we go after this life. That's why we have to look for the way of heaven

We have many plans for various things. The most important plan is that for heaven. When we go on a travel, we plan everything in advance. In the same way, If our plan is going back to heaven, we have to prepare everything on this earth. The bible teaches us that those who do the will of God can enter heaven. We should prepare by obeying the commands of God.