It is true. If we would truly let God's will take over, we would be happier than we could ever imagine and do greater things than we could ever imagine. Someone named Emmet Fox once said (or possibly wrote)(emphasis mine):
"The most secret, sacred wish that lies deep down at the bottom of your heart, the wonderful thing that you hardly dare to look at, or think about - the thing that you would rather die than have anyone else know of, because it seems so far beyond anything that you are, or have at the present time, that you fear you would be cruelly ridiculed if the mere thought of it were known - that is just the very thing that God is wishing you to do or be for him. And the birth of that marvelous wish in your soul - the dawning of that secret dream - was the voice of God Himself telling you to arise and come up higher because He had need of you."
I am sure we all have those things deep down inside of us, that we want to achieve but we are not sure if we ever will. Heck, for me, this page is one of those things... I always wanted to do something like this, but was scared that people would think it was dumb, or not like it, or nobody would read it, etc. Finally I decided that if I really wanted to do it and really felt called to do it, then all of that other stuff didn't matter!
Such is everything in life, all of our hopes and dreams. We might be met with failure (almost certainly), but that shouldn't deter us. If we are following our dreams and God's plan, then the pursuit will always lead us higher and closer to God and closer to what we were created to be.