Last week in my english class we watched a video about what a psycologist consider the motor which make us go forward and reach our goals. For her it's grit. I agree with her, but I think there is something more than grit, there is also greed.
I consider grit as the main reason of reaching our goals, for me the video in the link below is no more than a long way to say "If you will, you can". But I think that greed is also another reason why we keep struggling to reach our goals. You know, the feeling of getting what you want, to make big efforts to be the best in something, to get an enormous satisfaction from getting your goal achieved and then you want more and more, you'll never get satisfied and ever and ever wanting to be better, and expanding your goals more and more. That's what, in my point of view, define us as humans, the greedy animal who wants more and more and keeps progressing and reaching goals day by day.
After having written more than a 100 words for my composition about my opinion of the video, I think that I've make clear which two reasons make us progress in life.
Link: http://www.ted.com/playlists/158/graduation_now_what