{ 1 } - we have no knowledge of ethical truths.
{ 2 } - ethical statements can be translated into non-ethical statements.
{ 3 } - we can know ethical truths through moral intuition.
{ 4 } - facts about our feelings can be evidence for ethical beliefs.

Critical cognitivists admit that we can't DEDUCE moral claims from facts about our feelings. But they contend that the fact that we have certain feelings (or perhaps have them when we're informed and impartial) can make ethical beliefs reasonable or evident.

Chisholm argues that this approach gives a plausible defense of our commonsense belief that we do have moral knowledge -- and an approach that's similar to the most plausible way of defending our knowledge of external objects.