We have been set apart as holy because Jesus Christ did what God wanted him to do by sacrificing his body once and for all.
Every day each priest [under the Old Covenant] performed his religious duty. He offered the same type of sacrifice again and again. Yet, these sacrifices could never take away sins.
However, this chief priest made one sacrifice for sins, and this sacrifice lasts forever. Then he received the highest position in heaven. Since that time, he has been waiting for his enemies to be made his footstool. With one sacrifice he accomplished the work of setting them apart for God forever. (Hebrews 10:10-14 GW)
Why keep repeating the same thing over and over if it isn't effective and has less value? Why not choose what is perfect and guaranteed for eternity?
Pursuing our own efforts at goodness is futile. Exchanging our effort for Jesus' perfect work is wise. What will you choose today?