Hume’s law
Hume argued we can't logically move from describing what is (facts) to prescribing what ought to be (morals) without additional justification.
Example:
• Is: "Humans can eat meat."
• Ought: "Therefore, humans should eat meat."
This leap assumes a value (e.g., "following nature is good") but doesn't state it.
This is also called fact-value distinction.
Hume believed this gap exists because moral actions aren't driven by reason alone--they're ultimately guided by sentiment. Reason shows us facts, but it's our feelings that motivate what we think ought to happen.
What we do and say are driven by sentiment / feelings, not facts.