I've heard many times either from my parents, friends and teachers that time management is crucial. It is the most valuable item that you have, yet there are a drastic difference between how people spend it.
Of course I'm not a good time manager myself, I procrastinate and use twice or three times as much time as I need, often busying myself with unnecessary things.
One teacher told me that see the important things that you do in your life as the larger stones and pebbles in your day and the smaller things that aren't so essential as the sand that will fill the space in between the large stones.
Sure, that sounds very convincing and logical, but as most of the things are in life, it is easier said than done.