This chapter investigates Grotius’s broader intellectual involvement with the doctrine of predestination. Grotius deliberately renounced the religious importance of predestination as he called for religious concord in a time of fierce inter-confessional strife in the United Provinces - an endeavour that almost cost him his life. Considering his abhorrence for religious dogmas about divine predestination and human free will, two of his writings, Meletius and Ordinum pietas, display a remarkable restraint on Grotius’s part on the matter. Social and political order was not to be found in unrelenting dogmatic questions of certainty about what Grotius’s viewed as theologically non-essential religious principles. Rather it required a commitment to religious toleration. This chapter argues that Grotius’s involvement in the Dutch predestination debates reveals important philosophical connections between his religious and political ideas and allows for further explication of two central aspects of Grotius’s political theory: natural sociability and the impious hypothesis. From a careful contextualisation of predestination in Grotius’s religious oeuvre, emerges an account of socialisation independent of the predestination question, and establishes the infamous ‘etiamsi daremus’ statement as an obligation device that served his pursuit for religious and political accord.