Learn to work smart rather than working hard, nobody cares about your hardwork, they only care about the results.
There's no better gift a person can wish for than the gift of life. If being alive doesn't make you happy, then it's difficult for anything else to make you happy.
Nobody knows tomorrow, you just have to do your best to deal with things as they come in the future.
Always cherish what you have and don't ruin what you have for something that doesn't belong to you yet.