Upon returning to England after two years abroad, he presented to his parents a mature, sophisticated, well-mannered, "modish" gentleman, though Samuel Pepys noted young Penn's "vanity of the French". Penn had developed a taste for fine clothes, and for the rest of his life would pay somewhat more attention to his dress than most Quakers. The Admiral had great hopes that his son then had the practical sense and the ambition necessary to succeed as an aristocrat. He had young Penn enroll in law school but soon his studies were interrupted. With warfare with the Dutch imminent, young Penn decided to shadow his father at work and join him at sea. Penn functioned as an emissary between his father and the King, then returned to his law studies. Worrying about his father in battle he wrote, "I never knew what a father was till I had wisdom enough to prize him... I pray God... that you come home secure." The Admiral returned triumphantly but London was in the grip of the plague of 1665. Young Penn reflected on the suffering and the deaths, and the way humans reacted to the epidemic. He wrote that the scourge "gave me a deep sense of the vanity of this World, of the Irreligiousness of the Religions in it." Further he observed how Quakers on errands of mercy were arrested by the police and demonized by other religions, even accused of causing the plague.