Why you must always think big?

Last week I was using my motor bike for a short distance and I was seeing some small child being carried in the hot sun in a cycle. I was really disturbed and I was wondering and was really thinking that I am really blessed. And I thought that I should be satisfied with whatever I have. So that did not push me to set any higher dreams for myself. Later a bizzard incident happened. My A/c in my car conked. And I was really jealous of all those people who very in those long big cars and I was like how I wish I had those. And then it struck me, I must never be self contained. Because it will not make me to dream big and big. And at the same time not get distrubed about not having something. Aim big, reach big, achieve big.