For preaching and instruction unto salvation are received with fruit only when listened to in patience. And, beloved brethren, among the varied ways along which the Church is divinely guided towards heaven, I do not find any more profitable to this present life, or more helpful in obtaining future glory, than that we, who with reverential fear and devotion place our trust in what the Lord has taught us, should hold most carefully to patience.
To wage war only with the sins that make their appearance as actual deeds would be just as unsuccessful as cutting down weeds in a garden instead of digging them up at the root and throwing them out. Sins appear as inevitable outgrowths from their roots, the passions of the soul.
Let us be mutually mindful of each other, let us ever pray for each other, and if one of us shall, by the speediness of the Divine vouchsafement, depart hence first, let our love continue in the presence of the Lord, let not prayer for our brethren and sisters cease in the presence of the mercy of the Father.
What toil we must endure, what fatigue, while we are attempting to climb hills and the summits of mountains! What, that we may ascend to heaven! If you consider the promised reward, what you endure is less. Immortality is given to the one who perseveres; everlasting life is offered; the Lord promises His Kingdom.
They are the Church who are a people united to the Priest, and the flock which adheres to its Pastor. From this you ought to know that the Bishop is in the Church, and the Church is in the Bishop; and if anyone is not with the Bishop, that he is not in the Church, and that those who flatter themselves and creep in, and commune secretly with some, do so in vain, not having peace with God's Priests; while the Church, which is universal and one, is not cut nor divided, but is indeed connected and bound together by the bond of Priests who unite with one another.
Even a pious person is not immune to spiritual sickness if he does not have a wise guide -- either a living person or a spiritual writer. This sickness is called prelest, or spiritual delusion, imagining oneself to be near to God and to the realm of the divine and supernatural. Even zealous ascetics in monasteries are sometimes subject to this delusion, but of course, laymen who are zealous in external struggles (podvigi) undergo it much more frequently. Surpassing their acquaintances in struggles of prayer and fasting, they imagine that they are seers of divine visions, or at least of dreams inspired by grace. In every event of their lives, they see special intentional directions from God or their guardian angel. And then they start imagining that they are God's elect, and often try to foretell the future. The Holy Fathers armed themselves against nothing so fiercely as against this sickness -- prelest.