We all have heard that talent is overrated. The statement is true as we know countless stories of people with immense talent failing to achieve anything in life. This is because in most cases, the secrets to achieving anything meaningful is revealed to us by the nature when we devote certain amount of dedicated hours depending upon the magnitude of the problem. All real events are complex at the core and yet government by few basic laws. This is the ultimate law of nature. Moreover, the key tendency of Universe is to achieve a state of higher entropy which has higher randomness. This increase in disorder can be stopped only by apply external constructive force which helps to maintain higher energy (or low entropy state) to achieve anything. This external constructive force is nothing but state of self discipline which helps to maintain a state of high motivation and pinpointed focus towards the target.
So, self-discipline is the the utimate success mantra in this Universe, through which a person can achieve his goal through consistent effort towards a well-defined goal. This quality was the one on which our ancient rishis focussed in ancient times. But with the advent of the modern age, our generation finds it difficult to control themselves and often find themselves indulging in gambling, Non-veg food, procastination etc. and its leads to massive failures in life. Remember, a high degree of self-disciple is required to use our brain consciously for our benefit.