Afflictive emotions - our jealousy, anger, hatred, fear - can be put to an end. When you realize that these emotions are only temporary, that they always pass on like clouds in the sky, you also realize they can ultimately be abandoned.
When we meet real tragedy in life, we can react in two ways - either by losing hope and falling into self-destructive habits, or by using the challenge to find our inner strength.
Anger cannot be overcome by anger. If someone is angry with you, and you show anger in return, the result is a disaster. On the other hand, if you control your anger and show its opposite - love, compassion, tolerance and patience - not only will you remain peaceful, but the other person's anger will also diminish.
We need to make material progress, but we need inner development too ... remember that the real development we seek is not in the buildings but in our hearts and minds.