In one's growth there needs to be a stable foundation to build upon. Befosre a builder builds a house he first levels the area and lays a solid foundation. Withought the solid foundation the house may crumble and fall down.
Consistancy of responsible thinking and behavior provides a stable foundation to build one's life upon, no matter what you are trying to build. IN Character develop, that consistancy comes in the form of regular habits. Habits are things tha you do regularly without having to give it much thought.