A man, who is constantly engaged in action and works hard until he has achieved his goal undergoes lots of metamorphosis and positive change which helps in his self improvement.
Only those, who work hard can think of achieving something. Sitting idle or hoping for results without making any effort is nothing but foolishness.
After a hard day's of work,the night gives us an opportunity to take rest and relax. Thus, our batteries are re-charged and we are ready for the challenges of the next day.