...grasp the demands and exactions of business life. He learns that the main thing to do is to deliver the message to Garcia....

The positive elements in an ordered ring allow us to compare elements to 0, but we know in the integers that we can compare any two elements to each other. For example, we know that 4>2 because 4-2>0. We can extend this idea to any ordered ring. If R is an ordered ring and a,b∈R, then we know by trichotomy that exactly one of the following must be true: a-b>0, a-b=0, or -(a-b)>0.

Things like using Archpaladin to mitigate true damage, or recommending Health Vamp on farming classes that don't benefit from it.

But gie me a cannie hour at e'en, My arms about my dearie O; An' warl'y cares, an' warl'y men, Mae a' gae tapsalteerie O!