Petrarch is traditionally called the father of Humanism and considered by many to be the "father of the Renaissance." In his work Secretum meum he points out that secular achievements did not necessarily preclude an authentic relationship with God. Petrarch argued instead that God had given humans their vast intellectual and creative potential to be used to their fullest. He inspired humanist philosophy which led to the intellectual flowering of the Renaissance. He believed in the immense moral and practical value of the study of ancient history and literature – that is, the study of human thought and action. Petrarch was a devout Catholic and did not see a conflict between realizing humanity's potential and having religious faith.
A highly introspective man, he shaped the nascent humanist movement a great deal because many of the internal conflicts and musings expressed in his writings were seized upon by Renaissance humanist philosophers and argued continually for the next 200 years. For example, Petrarch struggled with the proper relation between the active and contemplative life, and tended to emphasize the importance of solitude and study. In a clear disagreement with Dante, in 1346 Petrarch argued in his De vita solitaria that Pope Celestine V's refusal of the papacy in 1294 was as a virtuous example of solitary life. Later the politician and thinker Leonardo Bruni argued for the active life, or "civic humanism". As a result, a number of political, military, and religious leaders during the Renaissance were inculcated with the notion that their pursuit of personal fulfillment should be grounded in classical example and philosophical contemplation.