“The man who waits for roast duck to fly into mouth must wait very, very long time.” – Chinese proverb
Knowing what you want to do and actually getting it done are two different things.
Think about it this way: there is a no-man’s land between every goal that is set and every goal that is accomplished. That no-man’s land begins as unclaimed and uncharted territory, but with the application of focused and sufficiently persistent work, it gradually becomes familiar as it is traversed.
The process of achieving any goal involves the transformation of the unknown into the known. Self-discipline allows this to be done. The ability to do the right thing when it needs to be done without external control or coercion is the measure of self-discipline. And self-discipline is an essential element of physical, mental, emotional, and spiritual maturity.
Self-discipline at one level (e.g. physical or mental) provides foundational support for the development of self-discipline in the other levels. As such, the successful handling of the small, seemingly insignificant details of life contributes significantly to the pattern of victory in the larger goals and aspirations.