Concerning the inspirational passage in the OP:
Stripped of questions of attribution, stripped of God and the religious issues, and purged of the chicken-soup-for-the-soul and glurge-filled mode of expression, I think the passage does, in fact, contain an important truth.
When we are children, our fears are simple: The world is big and complex and fast-moving, and we are small and weak. If we're not careful the world may slam into us, roll over us, and leave us lying mangled by the side of the road.
But when we are adults, our fears may be more complex. We may be competent or even brilliant in most areas of our lives but balk at doing simple things because we feel too clumsy or conflicted. One wrong move, and the environment around us may collapse like a house of cards or entangle us like a spider web or swallow us like a quicksand bog.
Thus, you have the phenomenon of intelligent, capable adults spending their lives alone because they didn't learn the rules of socializing and dating when they were teens and now they figure they'll just make a hash of it and upset everyone so it seems simpler to avoid it outright. Or you have people putting up with dysfunctional relationships with parents, friends and family because it seems safer and easier to put up with abuse and frustration than to risk upsetting the apple cart by asserting oneself. Or you have competent people who remain in unchallenging fields or jobs or positions because it seems too late in the game to start go back to school and change fields or contemplate a move into management and compete for a leadership position.
We see other people around us cutting a wide swath in life and maneuvering confidently and safely through these same obstacles, but we assume they had a better upbringing than us or have some special quality that we don't have or they are simply too stupid to see all the dangers around them. Or we open up and unburden ourselves in anonymous environments like Internet message boards and find support and understanding there, but we don't trust people in real life to operate the same as people on anonymous forums.
So in this kind of context, the passage in the OP can be helpful and even reveal an important truth or two: If others can do it, then why not me? Who or what am I really serving by hiding my capabilities and desires from others? Is it okay to assert myself, even if it means possibly putting myself in opposition to people I care about?
My opinion:
It's actually not that hard to get ahead and achieve what you want. For example, sooner or later most people routinely take a little time to learn the basic rules of personal investing. They learn the benchmarks for success and failure, study the risks involved, and then invest their life savings and trust the system to work. Well, most other big challenges in life are pretty much the same. You take a little time to learn the rules, you figure out a couple basic principles or benchmarks that will help you measure progress and avoid getting sidetracked and bogged down in irrelevant details (remember the Clinton campaign formula: "Keep it simple, stupid!"), and then you jump in and trust the system to work.
Those who have already succeeded and achieved what they want in life will usually vouch that it's not that tough or dangerous to get ahead. They may even try to boil things down for you and try to spell out some of the basic principles or benchmarks that they themselves found particularly important for getting ahead. See the following thread for a good example:
http://www.typologycentral.com/forums/nt-rationale/2311-manual-intjs.html
But still there is ultimately a leap of faith involved. The first-time investor has to put his life savings on the line and trust the system not to grind his money up and swallow it whole. The person hitting the social circuit for the first time has to put his feelings on the line and trust the social system not to grind his emotions up and swallow them whole. And so on.
And that's where an inspirational passage like the one in the OP can come in handy. It's a reminder that others have done it and you can too.
So you use the passage in the OP as a wake-up call and look at the fears that are holding you back and weigh them against what you would like to achieve. And then maybe you seek out the advice or example of others who have already achieved the things you want (like ps646566's "Manual for INTJ's" thread, or maybe a biography of an admired public figure, or maybe a self-help book) and see if the basic principles and benchmarks that they used will work for you too.
And then, finally, you take what you've learned and make your own choices and do what's right for you. After all, it's your life.
I'm the one that's gotta die when it's time for me to die
So let me live my life the way I want to
"If 6 was 9," Jimi Hendrix