What if we only heard Jesus' calling as a "future" Kingdom and not as the "now and not yet" Kingdom?
Let's look at one of the parables...
To me, this one is the easiest to see in terms of a future Kingdom. The smallest of seeds takes time to grow. It takes time to sprout and become the largest in the garden. We can sow and water and sow and water that littlest seed. Tend to its roots as if they were our own heart. And that is exactly what we are called to do. We are called to cultivate the Kingdom come. The Kingdom grows from the planting of the gospel in hearts of men. The Word of Christ from small beginnings can cause enormous growth and have influence attracting people to Christ from far afield. This is represented by the birds coming to nest in the branches.
So, we can see that largest tree as the Kingdom of just the future - of where we end up. Or we can look at the process of Kingdom-come from this parable. It should be impossible for this tiniest of seeds to grow in to anything... but it does. It is the promise of the Kingdom come. BUT, if the Kingdom-come is that largest tree, then the Kingdom is still here today as we sow and water and sow and water. We are not merely sharing the word of Christ for a future hope, but for today. Yes, our hope is that Heaven will come down, and the Kingdom will reign rightfully. But the Kingdom is still here today. We are still preparing. We have to present in this day as we sow and water and sow and water the Kingdom so that this tiniest little seed beats the impossible odds of growing at all.
The journey to Kingdom-come matters. The sowing and watering and sowing and watering. It matters.