Rudaki is the father of Persian poetry and the greatest poet of SAMANID ERA. In spite of the fact that there exists only less than 1000 lines of his numerous poems now, about half of which are Mathnavis, Elegies, and Sonnets, the variety of his poetic form and meaning is noteworthy. He composed the first and the best samples of elegies, sonnets, cadent lines, quatrains, eulogies, satires, autobiographies, expositions, wisdom poetry, admonitions, ethics, and poetry dealing with inebriation.In his sentimental and wisdom poems of his Divan, we can notice the expression of the "invalidity" and "instability" of the world, the "transience" of the benevolences and the pleasures they provide, the dominance of "death" in human's fate, decrepitude in the presence of the ridiculing "games" of the day, fatalism, conquering destiny, invitation to senselessness, oblivion, gaiety, and seizing the time, which comprise the subject matters of Khayyam's quatrains, also. These kinds of concepts were used by the poets before and after Khayyam; they should be considered as cultural and humanistic factors, replacing the exclusive philosophy and cosmology of an individualistic idiosyncrasy.When coming to Khayyam and Rudaki, it is imprudent to talk of the question of influence and being influenced. Khayyam is obliged by Rudaki as far as two things are concerned: 1) Rudaki is the person who invented quatrain meter or at least tried to form and develop it; and 2) he precedes Khayyam in looking wisely at the universe and creating such sentimental and wisdom concepts.