That is'nt easy. A normal human being have all natural feelings like depression, sadness, anger etc, which we go through in the worst moments of life. Age, experience, our determination to acquire some self development lessons can make us mature enough to think positive in any adverse conditions. Hopes that everything will end well, & all that happens is for our good can make u think positive. We should know that life is full of ups & downs, & nobody can escape tragedies & calamities, & we have to live on, with hopes for a better day ahead.....