what does something we must to have in life? which is the we nice to have? that's a regular question for around us , maybe we thought about it sometimes or when we wake up in every morning. cost in life, it means that we spend low money, utilize less time. but what thing is we must to have, the air ,the water, the sunshine, these are belonging to the nature. we can breath the clean air, drink the clear water and take a shower in warmly days. wearing clothes on our body,meanwhile ,the safety place that we live is also a necessary. the nice to have is always that we expect mostly. try our best to achieve the wonderful things, it can let our life into high promotion and quality life. such as to have a better and more function car instead of the current one. To travel abroad with our family in every year to accomplish in schedule. Living in a big house with family members. these need to work hard than normal to achieve them. how to balance them in our life, for example, if we have 100 RMB only that we are hungry, we should to choose a full and nice restaurant or snack at KFC for our lunch. Or other thing, how to judge a better tool when we need from Shanghai to Beijing, take a plane or take a train, or drive by ourself. this is also need us to balance our own situation. if you are urgent, choose a plane is best, but if not, the train is better. it can make you relax your body and see the beautiful sight on the way. we live in a finite world, they are full of uncertain elements and temptation around us . we can't distinguish it clearly which are we must to have or nice to have. it's hard to balance or choose. one point is cleared for me, choose the suitable for, not the most expensive. especially in modern society of china, we choose some of expensive that we don't need or others cheap one can replaced it completely. just for their vanity. i heard a message from my friend before. they almost buy a better car using their total money in their hometown. having no place to live except the car. i don't want to say that whether it's suitable, everyone have different attitudes for life. to be balance in your daily life.