Expensive is not the best teacher, experience is the best teacher only if you have an optimist attitude. Two people can have same experience in life, but the choice to either learn from that experience or be disgust about it depends on the attitude of each of them.
An optimist in attitude focus on future possibilities rather than present circumstances, while a pessimist in attitude always channel his energy to see the circumstances of the present day, the attitude choose by each of them is their difference.
A famous quote by Aristotle "we are what we constantly do, success is a habit,not an act"- our attitude forms the habit we exhibit, our habits creates and feeds our subconscious mind. If our subconscious mind is filled with negative thoughts,then is also the product of our reality.
A well define life should consist of purpose (goal), passion (what you love to do) and an optimist attitude.
The vehicle of life are purpose and passion, but the driver is attitude.