He wrote, 'Constancy is a right and immovable strength of the mind, neither lifted up nor pressed down with external or casual accidents.' Only a 'strength of the mind', he argued, based on 'judgment and sound reason', can help you through confusing and alarming times.
Õpetlase väite kohaselt saab ainult selline „vaimujõud”, mis toetub „arusaamisele ja tervele mõistusele”, aidata inimest segastel ja ärevatel aegadel.