How to achieve a peaceful life?

Have you seen any buffalo , have you realize peace in buffalo, they looks very peaceful . Every animal on this earth follow law of nature , they know what they can do and what they can not do , so basically they are very certain .So once stomach full ,they need nothing . But in case of human needs start after once stomach full, empty stomach only one problem "Hunger" once stomach full humans have 100 problems . So how shameful it is that what is our ultimate goal (peace) a animal can easily achieve but humans struggle for it .How much peace is important in human life?Suppose today you are not peaceful , can you enjoy night dinner , can you enjoy walking on street ? no you can not . Actually we are not peaceful because of our freedom ,we have freedom to shape our life in our own way , we do not follow law of nature . Few people tell you about heaven ,do you have any proof that this human life is not a haven(human life), you are making hell to this heaven , have you seen earth from top it looks beautiful than any other planet.Actually we are not peaceful because of our freedom ,we have freedom to shape our life in our own way , we do not follow law of nature .Few people tell you about haven ,do you have any proof that this is not haven(human life),you may be already in a heaven and you are making hell out of it , have you seen earth from top it looks beautiful than any other planet .Let's talk some very fundamental things , suppose today you are earning 100 rupees per day ,after few day's you are not happy , again you start earning 2000 after few month you are again not happy. Even you will be queen/king of this planet , after few day's you will not be happy, now want other galaxy too. We need to learn way to accept new challenge in our life , if we see challenge as a problem peace is impossible .Simply saying desire is a endless process , and i am not saying desire is not good ,but desire create challenge so we need to make our self in such way that we enjoy challenge instead of taking it as another problem.Let me explain you peace “peace does not mean to be in a place where there is no noise, trouble, or hard work. Peace means there are troubles ,hard work ,chaos around us, still we are calm from inside . This is the real meaning of peace .”The peace that we seek is only possible in the graveyard .The real peace is the serenity and tranquility within, when there is chaos all around us. Peace never exist out side around us, it is a inner process
In End a very small point I would like to tell ,that till morning to night there are lot of work we do like bathing ,hair comb ,job etc but if we see every thing as a problem, than peace is not possible we need to explore every thing and have a pleasent experience of every things which we face.