St. Ignatius teaches, “The prayer rule, chosen prudently to suit one’s strength and manner of life, offers great support to those seeking to attain salvation. Observance of the rule at the proper times of day and night turns into a habit, into a natural and indispensable requirement. And as soon as the one who has acquired this happy habit comes near the place where he usually performs the rule, his soul is filled with a prayerful mood, and before he can even begin reciting his prayers, his heart is filled with emotion and his mind withdraws into his inner chamber [the heart].” 

St. Isaac the Syrian says: “It is not for abandoning Psalms that we shall be adjudged by God on His Judgment Day, not for abandoning prayer, but for the entry of demons into us which follows. When demons find the place, they come in and shut the doors of our eyes, and then they use us, as their instruments, to perform forcibly and uncleanly, with the worst of vengeance, everything forbidden by God. And because we abandon a small [rule], which grants us Christ’s intercession, we fall under the sway of demons, as one most wise abba wrote: ‘He who fails to submit his will to God, such a one shall submit unto his adversary.’ These rules may look small to you, but they shall be the walls protecting you from those who want to take you prisoner. The keeping of these rules within your cell was most wisely established by the makers of the Church rule, by a Divine revelation, in order to safeguard our life.” (Homily 71)  

Text: https://pravoslavie.ru/81258.html 

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