How could we become anything else?
You will find this reflected in powerful texts, wonderful works of art, and in the lives of the successful.
In fact in the Bible's Proverbs 23: 6-8 we get a warning of what happens if we let others (news, politicians, professors, and TV?) do our thinking for us.
Eat thou not the bread of him that hath an evil eye, neither desire thou his dainty meats: For as he thinketh in his heart, so is he: Eat and drink, saith he to thee; but his heart is not with thee. The morsel which thou hast eaten shalt thou vomit up, and lose thy sweet words.
As he thinketh in his heart, so is he ...
We need to be proactive - searching out the best and seeking to understand. Think, don't just follow.
We don't have time to dwell on the negative - that will make us increasingly negative also.
Goals alone are not enough. We must constantly redirect our own thoughts toward apprehending our full potential.