Warren’s observation cuts: there are only two things you can do on earth that you cannot do in heaven — sin, and witness to unbelievers. Worship continues in heaven. Fellowship continues. Discipleship, in some form, may continue. But evangelism — reaching people who don’t yet know God — is a purely earthly, time-limited activity.
This reframes the whole question of how much priority evangelism deserves. It’s not just one of five equal purposes. It’s the one purpose with an expiration date. The window for reaching any given person closes at their death. The window for reaching the world closes at the end of history. Which means the church that makes evangelism a secondary priority — something it gets to after the core community is satisfied — is wasting a non-renewable opportunity.
Warren uses this to explain why God leaves Christians on earth after salvation rather than immediately taking them to heaven. It’s not because earth is better than heaven. It’s because the Great Commission is still unfinished, and believers are the means through which it gets finished. Remaining here is a calling, not a delay.
For a worship leader, this has a specific implication: Sunday service exists partly because of this time-limited window. The person in the room who doesn’t know God yet — the moment they’re in that room is the moment the window is open. Designing the service with their experience in mind is stewardship of a non-renewable opportunity.