Final answer:
Francisco Suarez did not agree with Thomas Aquinas that natural law is determined through observation; Aquinas believed it could be discovered through reason and Suarez emphasized divine illumination.
Step-by-step explanation:
The statement that Francisco Suarez agreed with Thomas Aquinas that we determine natural law through observation is False. Thomas Aquinas believed that natural laws could be discovered through reason, as they are part of the natural order of the universe. Aquinas asserted that human laws must align with these natural laws, and he saw values as objective because they upheld the natural order, which is not subjective. In contrast, Suarez believed that natural law was known through divine illumination rather than mere observation.