St. Benedict
Of Humility

Brethren, the Holy Scripture crieth to us saying: "Every one that exalteth himself shall be humbled; and he that humbleth himself shall be exalted" (Lk 14:11; 18:14). Since, therefore, it saith this, it showeth us that every exaltation is a kind of pride. The Prophet declareth that he guardeth himself against this, saying: "Lord, my heart is not puffed up; nor are my eyes haughty. Neither have I walked in great matters nor in wonderful things above me" (Ps 130[131]:1). What then? "If I was not humbly minded, but exalted my soul; as a child that is weaned is towards his mother so shalt Thou reward my soul" (Ps 130[131]:2).

Hence, brethren, if we wish to reach the greatest height of humility, and speedily to arrive at that heavenly exaltation to which ascent is made in the present life by humility, then, mounting by our actions, we must erect the ladder which appeared to Jacob in his dream, by means of which angels were shown to him ascending and descending (cf Gen 28:12). Without a doubt, we understand this ascending and descending to be nothing else but that we descend by pride and ascend by humility. The erected ladder, however, is our life in the present world, which, if the heart is humble, is by the Lord lifted up to heaven. For we say that our body and our soul are the two sides of this ladder; and into these sides the divine calling hath inserted various degrees of humility or discipline which we must mount.

The rest: http://www.kansasmonks.org/RuleOfStBenedict.html#ch7