I recently watched Dead poet's society, a movie starring Robin Williams. Its about the profound influence that some teachers have in our life. Robin William's played the wonderful Mr. Keating in this movie, who teaches English (poem) and life lessons at the same time. In one scene, he would mention carpe diem (originated from a latin poem by Horace), which means seize the day.
Carpe diem (seize the day), try saying it, feel it.
The most simplest of all life's rule, lesson, is this. Seize The Day. Make use of your day. Make it your own. Do what you do everyday for yourself, not for your mum, dad, teacher, boss, nosy neighbour, friend and etc. When you feel demotivated during the day, down, uninspired, lazy, moody, just say carpe diem. You are not going to live forever. Seize the day, make it your own and mark your place in this world.