The most important thing for peace and prosperity in this world is positive and virtuous behaviour. Until man’s behaviour is such, that everyone around him is happy, he cannot be happy himself. His mind will forever be perturbed, new thoughts and ideas will keep troubling his mind and he will suffer from some unknown fear.
Shrewdness, show-off, degrading others, display of ego, etc, should not be a part of our behaviour. If we have these vices, people will have negative feelings towards us and such negative vibrations will create painful and sorrowful situations in our lives. Neither will we be able to live happily in this lifetime, nor will we be at peace after death due to lack of progress in our spiritual journey and path. Those who behave badly suffer with great miseries after death.
At the time of death, such people suffer a lot while leaving the body and after death, while waiting to enter into another body form the subtle body experience more than hellish pain. We must die in such a way that we should not even feel that we have died (painless death). Our soul should leave the body in such a smooth manner that the body should not experience that it became lifeless. And this can happen only when the behaviour of the body was amicable in its lifetime, the mind remained calm at all times, when the body attracted more blessings than curses of others, had no expectations or demands from anyone, loved everyone equally but had no attachments nonetheless.