The environmental crisis arises from a fundamental fault: our systems of production - in industry agriculture energy and transportation - essential as they are make people sick and die.
Frustration although quite painful at times is a very positive and essential part of success.
The family is the first essential cell of human society.
It seems essential in relationships and all tasks that we concentrate only on what is most significant and important.
It is essential to do everything possible to attract young people to opera so they can see that it is not some antiquated art form but a repository of the most glorious music and drama that man has created.
A safe and nutritionally adequate diet is a basic individual right and an essential condition for sustainable development especially in developing countries.
Old age and sickness bring out the essential characteristics of a man.
Maintaining healthy forests is essential to those who make a living from the land and for those of us who use them for recreational purposes.