This publication is a "Word of ascetic" St. Isaac the Syrian, the greatest theologian of the VI century. According to Reverend Filaret (Gumilevsky), "St. Isaac his whole life devoted solitary study of his soul, and nobody's teachings are not performed such deep psychological information as the teachings of St. Isaac himself proshed degree of spiritual contemplative life, St. Isaac is sublime teachings of contemplation and based on solid experiences. Spiritual life is depicted in his sermons in the annex to the most subtle state of the soul. " Great Spirit-bearing ascetic, Reverend Isaac in his "word" reveals his own spiritual experience for people seeking the ultimate goal of human existence - communion with God and the salvation of souls. Text "ascetic words" published in translation from the Greek, implementation and published in 1854 by the Moscow Theological Academy. Selected explanatory notes in this volume drawn from the text of the third revised edition of "ascetic words" St. Isaac the Syrian (Trinity-Sergius Lavra, 1911). Translation in the publication of 1911 verified with the transfer of Venerable. Paisius Velichkovsky, with the text on the publication of Nikephoros Theotokis, with the Greek manuscripts of the Moscow Synodal Library and some translations from Syriac into Western