If you can earn it, you can take credit for it and therefore pride in it. If it is completely unattainable — too lofty for feeble attempts — then we are humbled and full of deep gratitude and overwhelming love for the One Who earned it for us when we were completely unworthy of it.
How attainable is infinite perfection and the infinite God?
A measure of goodness/”perfection” might move us ahead of another human but compared to the infinite, it is as nothing.
He is either a god whose goodness is limited and thus attainable, or He is a God of infinite goodness so that the One cannot compare to anything else.