Henry Vaughan, as almost the last of the 17C metaphysical poet, has been called a mystical nature poet. He found God's world in nature through his divine observation. It means that he did not find a beauty in nature but he found God's divine providence in nature. We know that he is only a religious poet commonly, but he wrote both religious poems and love poems as John Donne and Andrew Marvell in his time. Since his early love poems were affected by Petrarchan style, they consist of classical love patterns but were influenced by metaphysical poets after his late love poems contain more mature love affairs included metaphysical elements. From George Herbert, who gave a great influence to Vaughan, he turned his poetical thought secular to religious. However he could never imitate Herbert absolutely, but created his own poetic thought through self analysis combined with Neo Platonic thought and Hermetic philosophy. Since he had a mystical expressions in his poetic thought, he can see the way to ascend to God's world through death. Both his secular and religious poems, it shows the relation between secular poems and religious poems in same imagery and in using nature scenes. Death especially revealed a main theme in both poems. There are three steps in his religious conversion such as beginning, development and complete. All those are influenced by death directly and indirectly. It gives him a observation to find a new world, the God's world, in nature. According to the religious conversion the structure of Silex Scintillans I, and Silex Scintillans II formed a sequence of death and regeneration.