Christ promised the early church the Spirit, who came on the first Pentecost and continues to dwell in the lives of the faithful. He promised that the Spirit would abide with this community, guide it, lead it to all truth, and help it recollect the words of the Lord. This is just what has been happening for the 20 centuries since the ascension.
Awhile back, my parish priest told me that he used to get down on his hands and knees to eat the post-communion bread crumbs off the aisle floors. He didn’t mean it to be funny, and he definitely didn’t think it was all that weird. We were just having a conversation, and it came up.