Be eager to serve the Lord and be not satisfied unless you are serving Him.
Don't sit around waiting for the Lord to give you something to do; go to Him and ask Him for something to do.
Whatsoever He says unto you to do, do it.
When you have finished doing what the Lord has asked you to do, go to Him and ask Him for more to do.
Be diligent in your effort to serve Him; put your whole being into the effort, holding nothing back.
Keep on serving the Lord for the rest of your life; for the work of the Lord is never done.
John the apostle wrote his gospel when he was about one hundred
years old; his greatest work of God