A famous two liner by Thiruvalluvar discloses the importance of discipline and that discipline is more important than even ones life.
First let us reflect what the ancestors have told:
Take care of your thoughts, as your thoughts become words!
Take care of your words, they become your actions!
Take care of your actions, as they become your habit!
Take care of your habits, as they form your character!
Take care of your characters, as they determine your fate!
Through the above, we can understand that our good thoughts will lead to good fate. Those who crib that, This is my fate, need to retrospect over their thoughts.
How are habits formed?
To carry out a task, what and why do we need to do is our knowledge. How we need to do it is our skill. Doing it willingly is interest. If we continuously do anything and everything with knowledge, skill and interest, it becomes our habit.
When the three - knowledge, skill and interest amalgamates a habit is formed. Hence, if we happen to alter one or two or all three of these factor, we can break loose of a bad habit or form a good habit.
Aristotle, the philosopher says like this, You are the embodiment of what you think. So, successful skill is just a habit not an action.