Because humility is by nature something that exalts, something loved by God which destroys in us almost all that is evil and hateful to Him, for this reason it is difficult to attain. Even if you can easily find someone who to some extent practises a number of virtues, you will hardly find the odour of humility in him, however you search for it. It is something that can be acquired only with much diligence.
If we are concerned with our salvation, there are many things the intellect can do in order to secure for us the blessed gift of humility. For example, it can recollect the sins we have committed in word, action and thought; and there are many other things which, reviewed in contemplation, contribute to our humility. True humility is also brought about by meditating daily on the achievements of our brethren, by extolling their natural superiorities and by comparing our gifts with theirs. When the intellect sees in this way how worthless we are and how far we fall short of the perfection of our brethren, we will regard ourselves as dust and ashes, and not as men but as some kind of cur, more defective in every respect and lower than all men on earth.
St Basil the Great, mouthpiece of Christ and pillar of the Church, says that a great help towards not sinning and not committing daily the same faults is for us to review in our conscience at the end of each day what we have done wrong and what we have done right. Job did this with regard both to himself and to his children (cf. Job 1:5). These daily reckonings illumine a man’s hour by hour behaviour.