my time is not mine, it is the Lord's

"Or do you not know that your body is a temple of the Holy Spirit who is in you, whom you have from God, and that you are not your own? For you have been bought with a price: therefore glorify God in your body."

1 Corinthians 6:19-20

Paul here is speaking of purity, but it applies also to how we are whether it involves in this context sexual sins or not. Our time is not ours, it is His.

A great series CJ Mahaney had on his website.