The first people to be called Christians were first called “disciples” of Jesus Christ (Acts 11:26).  A disciple can be best defined as a student/follower of a Teacher/Leader, who studies a discipline (profession) to gain mastery over it and become equipped to pass on the training to others.  The term is mostly used in a religious or philosophical context.

Every person that chooses to be called a Christian is saying that they are disciples of Jesus Christ.  As disciples, they are submitted to the discipline of Christ, to follow Him as He leads and trains them in the knowledge of His ways.  A Christian who is not a disciple of Jesus is not truly a Christian.  When one becomes a Christian, they are submitting themselves to be led and disciplined, by Jesus Christ or those to whom He has given authourity to train others, and who continue to be submitted to His leadership (1 Cor 11:1).

The practice of discipleship seems to have been forsaken by the Church now, and most people who regard themselves as Christians are not disciples at all, and do not necessarily live disciplined lives as to be expected of disciples of Jesus Christ…

Read more at https://ufuomaee.blog/discipline-and-christianity/