They were expressions of individual psychology. Most of us aren't as successful in this quest as we'd like to be, so we resort to what gives us a perverted sense of power. We criticize or call evil in others what we find least evident in our own paltry lives, and praise or call good what we find most evident in our own lives. What appears to be an objective moral judgment turns out to be a thinly veiled self-justification at the expense of those whom we envy. At times, anti-gay rhetoric smacks of this same ideological function.
Gays are evil.
I'm not gay. Therefore, I'm good. Detecting a logical fallacy in such reasoning only skims the surface, according to Nietzsche, when what's really going on here is a thinly veiled attempt at self-justification and revenge. Jesus' parable deftly reveals the underlying psychology of the disgruntled, hard working laborers. They are critical of those who don't work as long yet receive equal pay because they think they deserve more.