For which of you, intending to build a tower, does not sit down first and count the cost

Luke 14:28
For which of you, intending to build a tower, does not sit down first and count the cost, whether he has enough to finish it.

This verse is commonly used to encourage us to realise the cost of following Jesus. It can also be thought of in another way, that is the cost that Jesus Himself has paid. We can never pay as much as Jesus did. Although we may make various sacrifices, it is nothing compared to the sacrifices that He made. And the cost was fully paid for by the Lord, that is why we can have the confidence that the salvation He promised is justified.

So that I may finish my race with joy

Acts 20:24
so that I may finish my race with joy, and the ministry which I received from the Lord Jesus, to testify to the gospel of the grace of God.

There is satisfaction in completing a task or mission we are assigned. How much more satisfaction if that task or mission is appointed by God. This is what Paul speaks about when he mentions completing the race. The mission is none other than doing what Yshua has appointed us to do. The details of the task may differ for each one of us, but the end goal is the Great Commission in bringing the gospel to the world. If we have experience satisfaction in completing our worldly assigned tasks, try pursuing God's task and see the rewards roll in.