What does this Much Ado quote mean, "I can see a church by day light'?

Solution 1:

Beatrice has just been speaking very satirically and at great length against marriage. This rather annoys Leonato, who is in the middle of trying to marry his daughter to the Prince, so he responds with a backhanded compliment: "you apprehend very shrewdly" can be taken to mean both "you perceive very acutely" and "you treat the world very abusively". Beatrice shrugs this off, saying that her perception is no keener than is needed to see a very large building in daylight—that is, "I can see what's right in front of me".