Self-Indulgence is: You THINK about how you FEEL and decide whether you want/can/should execute, then You decide whether to ACT or not and you worry about the CONSEQUENCES later.
Self-Discipline is: You THINK about the CONSEQUENCES if you do or don’t execute. You decide to take ACTION (with the consequences in mind) and FEEL good about your progress.
“Try is dead, will do killed it.”
Source: Richard Weylman