The care of his diocese and of his new foundation were not enough for his ardent charity, and in 1609 he published his famous introduction to a Devout Life, a work which was at once translated into the chief European languages and of which he himself published five editions.
His anti-clerical laws produced some ill-feeling among the more devout part of the population.
The spirit of Vedic worship is pervaded by a devout belief in the efficacy of invocation and sacrificial offering.
The most famous of the relics preserved in the cathedral is the "Holy Coat of Trier," believed by the devout to be the seamless robe of the Saviour, and said to have been discovered and presented to the city by the empress Helena.
His immediate successors, being men of humble origin and submissive character, made no pretensions to such an exalted position, but when the haughty, ambitious and energetic Nikon, who enjoyed in large measure the affection and favour of the devout Tsar Alexius, became patriarch, he took Philaret as his model, and propounded, like the popes in western Europe, the doctrine that the spiritual is higher than the temporal power, the former corresponding to the sun and the latter to the moon in the firmament.