All emotions are pain
All things have no inherent existence
Nirvana is beyond concepts
What makes you not a Buddhist is an easy to read book which highlights some of the basic tenets of Buddhism. The above four points are, he says in essence sums up what Buddhism is all about. I somehow disagree with the second point. I would have rather have it to be All emotions are ephemeral or All feelings are ephemeral. Of course each sentence has its own interpretation.
Man is ever greedy. One always seeks for a better state of bliss and happiness, joy and meaning in life. If one realizes that even these states are impermanent, he can continue to be in a state of infinite happiness. For the purpose of practicality, one doesn't need to cease to live the way he has been living. Instead, if one leads his life being aware of the point that all compounded things are impermanent, it's a much easier life to live.
Often, each day begins with so much baggage in one's mind. He often forgets that the mind which is carrying so much of unwanted thoughts is finally what brings him down. The world around is our own creation. Let go of the mindless thoughts to sense the true meaning of being free.
Because of our lack of mindfulness, our creations are transformed into something solid and real, and we become ever more enangled. When you fully realize , not just intellectually that everything is just your own creation, you will be free.