"The competent programmer is fully aware of the limited size of his own skull. He therefore approaches his task with full humility, and avoids clever tricks like the plague." [EWD340]
I am trying to understand this quote of Edsger W. Dijkstra. I understand that he emphasize to be a good programmer. However, I don't understand the meaning of 'the plague'. General meaning of 'the plague' is ill, but this context says it couldn't be.