In the spirit of those kindred souls Voltaire and George S. Patton, here's one way to measure the infinite: An infinite distance lies between nothing--the unsaid comment, the unwritten letter, the undone act--and something, no matter how much room for improvement remains. In comparison, the distance between that something and perfection is barely noticeable at all.
Or as Noah Lomax wrote in response to this post, "The greatest of intentions pale in comparison to the smallest of actions."