Value your time
Always place value on your time because your time is equal to your life. Whatever you do with your time is what you do with your life. Whatever value you place your time, is the same value you place on your life.
Your time here in this world is limited; so, every single second should have value attached to it. Do not waste time because wasted time can never be regained.
If you value your life, then you have to value your time.