An Understanding of the purposes and the popularity of Young's Night Thoughts is possible only through a realization of their relation to contemporary currents of thought. For the most part critics have confined their attention to the so-called personal element and the treatment of the theme of death, and have neglected perhaps the most outstanding feature of the Night Thoughts, the interest in Christian apologetics. Though the nine poems reveal a shift in emphasis and purpose—the first five, of 459, 694, 536, 842, and 1068 lines respectively, chiefly concerned with moral reflections on life and death, and the last four, of 819, 1480, 1417, and 2434 lines, almost wholly devoted to apologetics—there is throughout a fairly definite effort to defend one phase or other of religion. This rationalistic defence of religion places the poems in the current of apologetic literature so outstanding in the late seventeenth and the early eighteenth century. Analysis of Young's aims and arguments will show to what extent he is following those of the outstanding defenders of religion and demonstrate that the Night Thoughts are to be considered as largely an expression of contemporary apologetics.