Know how to Test. The care of the wise must guard against the snare of the wicked. Great judgment is needed to test that of another. It is more important to know the characteristics and properties of persons than those of vegetables and minerals. It is indeed one of the shrewdest things in life. You can tell metals bytheir ring and men by their voice. Words are proof of integrity, deeds still more. Here one requires extraordinary care, deep observation, subtle discernment, and judicious decision.