Growing up, I heard of the importance of not being “so heavenly minded you’re no earthly good.” C.S. Lewis seems to take a different stance. He states:
If you read history you will find that the Christians who did most for the present world were precisely those who thought most of the next. It is since Christians have largely ceased to think of the other world that they have become so ineffective in this.
– Mere Christianity, p. 134
Heaven is not simply about eternal destination. It is about citizenship. The teachings of the New Testament, particularly from the mouths of Jesus and Paul, make clear that citizenship in heaven is not reserved as a reward for Christ-followers once they die. Rather, for the Christian believer heavenly citizenship is a present reality. And that citizenship in the age to come while living in the present age is precisely what witnesses an alternative of abundant life in an otherwise decaying world.
So, without fear of being “so heavenly minded we’re no earthly good”…
Set your minds on things above, not on earthly things. For you died, and your life is now hidden with Christ in God. (Col 3:2-3)