Ethics without supernatural authority
The Amsterdam Declaration grounds ethics in the capacities of living beings to suffer and flourish, together with reason, compassion and responsibility.
Strengths
Its principles are expressly open to revision and do not depend on accepting a sacred text, prophet or religious institution.
Unresolved questions
Humanism still requires methods for resolving conflicts between individual freedom, collective welfare, human rights, animal interests and environmental limits. Reason can evaluate evidence, but it does not automatically choose every moral priority.