And this ability will help you to assess not just people, but also plants. With just one look, you'll know which plant will thrive where. Say there's an apple. And it happens to be particularly sour. That is definitely a good possibility.
Quinces grow well in windy places like the foot of the mountain.
With just one look at the earth, you could get a general idea of what grows there. Just as great parents produce great children, superior teachers produces superior pupils. Likewise, fertile soil produces sweet fruits. Man, no less than plants, is shaped by his environment. It just goes to show you how important environmental factors are in shaping one's character.