I believe that God exists. But I have this question from long time. By doing things like puja, homa, mantras etc , does it affect the destiny ? They say everything is pre written , then how does such things change your destiny. Some People say if you show true devotion to God then all the desires are fulfilled and it also has the capacity to change ones destiny. But there are so many cases where inspite of utmost devotion their desires were not fulfilled and couldn’t change the destiny. There are also incidents when people on pilgrimage have met with accidents and couldn’t survive. What is this called then? Does karma affect destiny or not?