A man may be consecrated, dedicated and devoted, but of little value if undisciplined. (Hudson Taylor)
A diligent person applies themselves to the business at hand. They are determined to get the job done. They are industrious, steady end determined to get the goal accomplished.
A disciplined person follows the rules, applying all their energies to the job at hand until it is done.
Might I ask you about your current goals? Is it your goal to lose ten pounds and that has been your goal since you were thirty and now twenty years has passed and still you say that you want to lose that same ten pounds?
Has this been your lifelong goal because your discipline fails at the sight of a piece of chocolate cake? Is it time to follow through on the goal or time to set a new one?
No discipline seems pleasant at the time, but painful. Later on, however, it produces a harvest of righteousness and peace for those who have been trained by it. (Hebrews 12:11)
Listen to advice and accept discipline, and at the end you will be counted among the wise. (Proverbs 19:20)