Moreover Frederick, who had proved by his wars the importance which he attached to Silesia, was indefatigable in times of peace in his attempts to justify his usurpation.
He had courage, a vivid sense of duty, an indefatigable love of work, and all the inquisitive zeal and inventive energy of a born reformer.
When the Committee of Public Safety made an appeal to the savants to assist in producing the materiel required for the defence of the republic, he applied himself wholly to these operations, and, distinguished himself by his indefatigable activity therein; he wrote at this time his Description de fart de fabriquer les canons, and his Avis aux ouvriers fer sur la fabrication de l'acier.
But through all situations of his life he preserved his equanimity, his keen interest in science, and his indefatigable zeal for the instruction of others.
From this moment may be dated the personal reign of Peter, for he now began to direct personally all branches of the administration, and governed with indefatigable vigour for twenty-seven years, during which he greatly increased the area and profoundly modified the internal condition of his country.