31 Then said Jesus to those Jews which believed on him, If ye continue in my word, then are ye my disciples indeed;
62 And Jesus said unto him, No man, having put his hand to the plough, and looking back, is fit for the kingdom of God.
-A disciple by definition is a follower of a particular discipline; the word “disciple” is right there in the root of the word “discipline”. It take discipline to keep your hand on the plow and not look back (Luke 9:62); just like it takes discipline to read your Bible every day (Psalm 1:2), pray every day (1 Thessalonians 5:17), be a light and a witness every day (Matthew 5:16, Acts 1:8), etc. It’s a lot to expect, but the Lord doesn’t expect it from everyone; He expects it from His disciples. How can any of us call ourselves disciples if we lack the discipline to follow Jesus?