Robinson Jeffers (1887-1962), the American poet, is one of the most typical examples of a poet who postulated his own philosophical doctrine and declared it in his poetry. His deep acquaintance with science on one hand and his religious background influenced by his parents on the other resulted in his two-fold philosophy. While bearing in mind. Some contradictory ideas in Jeffers' poetry, I intend to compare the most long-lasting notions in Jeffers' poetry on man's relation to God/nature and life/death with the philosophic writings and poetic works inspired by Persian mysticism in this short essay. Finally, I will explain how the notion of 'love' is introduced in the philosophy of both and what it signifies. The obvious affinities between Jeffers and classical Persian mystical poets with completely separate social and philosophical contexts and in different times manifest that the great themes of love, humanity, God, death, and nature are reflected in very similar manners in both poetic traditions.