It is human nature to always strive for the best and it is this trait which makes life sometimes a misery especially when we become too ambitious. Of course it is good to improve and live a better life and I don't see any wrong if people work hard to improve their life, to get better house, better food, better car etc. It is good to have an aim or goal in life as it gives hope and meaning to our life. However, we should not be greedy and should not turn our aspiration into an obsession as it can become unhealthy.