It is quite true that the growing Calvinism of the provinces was more dangerous both religiously and politically, than the Protestantism of the German princes, which had not yet been formally pronounced heresy, but it is thus the more evident that it was political rather than religious heterodoxy which the despot wished to suppress.
No man, however, could have been more observant of religious rites.

He heard mass daily.

He listened to a sermon every Sunday and holiday.

He confessed and received the sacrament four times a year.

He was sometimes to be seen in his tent at midnight, on his knees before a crucifix with eyes and hands uplifted.