I heard a story similar to the following at some point, but for the life of me I can't find an authoritative source. I believe that it's one of the Desert Fathers, but I'm not certain of that, either. Here it is, paraphrased from memory:
A novice asked to the father whether the fathers of ancient days were greater than the ones of today. And the father said, "Those who came before us did greater works than us, and those who follow us will be weaker still. And in the last days men will not be able to do any kind of spiritual labor at all, but those who endure to the end will be saved."