Quote: Thomas Kempis on considering ourselves better designers than others (ca. 1420s)

Thomas Kempis in The Inner Life:

A true understanding and humble estimate of oneself is the highest and most valuable of all lessons. Should you see another person openly doing evil, or carrying out a wicked purpose, [or launch a really bad website/app], do not on that account consider yourself better than him, for you cannot tell how long you will remain in a state of grace. We are all frail; consider none more frail than yourself.