His doubts over the Trinity were probably fostered during the time he spent in Italy and Switzerland, where many anti - Trinitarian refugees had found shelter.
Tema kahtlused kolmainsuse suhtes arenesid ilmselt ajal, mil ta oli Itaalias ja Šveitsis, kus paljud kolmainuõpetuse vastastest põgenikud varjupaiga olid leidnud.