In the West, Cassian's proposition that "the slightest glimmer of goodwill" could be attributed to the human drive was widely regarded as unacceptable in relation to the prosperity of the Augustinianism of the period (Conf. 13.7.1; cf Prosper of Aquitaine "Contra Collatorem;" Cassiodorus, "Institutiones" 1.29; "Decretum" "Gelasianum" V.7")". In his "Thirteenth Conference" and in writings to the Monks of Lerins, Cassian qualifies this by saying the good will is "stirred" by God: For when God sees us inclined to will what is good, He meets, guides, and strengthens us: for "At the voice of thy cry, as soon as He shall hear, He will answer thee;" and: "Call upon Me," He says, "in the day of tribulation and I will deliver thee, and thou shalt glorify Me." And again, if He finds that we are unwilling or have grown cold, He stirs our hearts with salutary exhortations, by which a good will is either renewed or formed in us.Cassian finds the will to be insufficient for spiritual progress, and traces this back to the initial sin of pride. Cassian illustrates advanced cases of the will's pathology in the "Institutions", saying these problems began when man "believed himself capable of attaining the glory of the Godhead by his "freedom of will" and hard work." To this end, Cassian believes the renunciate must conquer his will, overcome it, and even kill it.