The faculty of humanity is our capacity to feel, think, and choose with empathy, conscience, and reason; allowing us to recognize the worth of others and act beyond mere instinct, even when it is difficult.
From the Academic perspective
The faculty of humanity refers to the integrated human capacities for rational thought, moral judgment, emotional awareness, and social consciousness that enable individuals to interpret meaning, regulate behavior, and relate ethically to others within society.
More realistically, it is the scholarly way of saying that humans are not driven by instinct alone; we think, feel, judge right from wrong, and shape our actions with awareness of others and the consequences of our choices.