Future generations will need God as much as we do. Future generations will have things to deal with we cannot fathom. If you have children (or nieces and nephews) these will be your great great great grand children and great great great nieces and nephews. How can we help them? How can we live in such a way that our lives will be signs to point to God?
We can't live for temporal things. What I do can't be based in anything temporary. I have to do all things for God so they will have a sign in the wilderness, "Go this way."
"Whether, then, you eat or drink or whatever you do, do all to the glory of God." 1 Corinthians 10:31
"Then the LORD answered me and said, 'Record the vision And inscribe it on tablets, that the one who reads it may run.'" Habakkuk 2:2