Later he traveled to Italy, made extensive contacts with local humanists, and visited Galileo, who was imprisoned by the Catholic Church. After the British bourgeois revolution broke out, he actively participated in the revolution. Later, he became ill due to overwork and became blind, but he wrote with tenacious perseverance and achieved outstanding achievements. His representative works are the long poems "Paradise Lost" (1667), "Paradise Restored" (1671) and the poetic tragedy "Samson the Strong" (1671).