Sustainability is not a concept – it is the way nature is constructed.

What you can count is of minimal importance in life. What you cannot count, that really counts.  

Responsibility means being able to respond to whatever situations you may face in your life.

Throw yourself into things you can change and accept the things you cannot change, or you will end up upset and not do what you can.

The most precious thing in life is life itself. Are you getting it now or only on your deathbed?