Its an authority/humility thing.
We believe Christ granted authority. We don't need to keep reinventing the wheel.
And we're not so prideful to think that every generations reinvented wheel is actually as round as that of the First Wheelmaker. He did it right and entrusted it to the care of the Church He built and to which He granted authority to teach in His name.
Well put. And that Church would not be an invisible body. It is visible and it proclaims that it has the fullness of truth. What else makes any sense at all?
And now for a little Belloc:
Now the Faith is old and the Devil is bold,
Exceedingly bold indeed;
And the masses of doubt that are floating about
Would smother a mortal creed.
But we that sit in a sturdy youth
And still can drink strong ale
Oh--let us put it away to infallible truth
That always shall prevail.
And yet a little more.
But Catholic men that live upon wine
Are deep in the water, and frank, and fine;
Wherever I travel I find it so,
Benedicamus Domino
For our NC friends a little interpretation, the wine is the Blood of Christ and the water is baptism.