Why is a guide necessary? Because you can easily be lead astray. In prayer, you may experience visions or lights which are demonic and lead you to pride. A guide can help you deal with such such experiences. He can help you avoid being trapped by your pride and self will. He can guide you in a progressive way, growing step by step to the stage where you will see the true light.
Saint Porphyrios speaks of the danger of delusion,
And if in this spiritual dimension desire is enkindled, not by your good self, but by the other self, the egotistical self, then undoubtably you will begin to experience a pseudo-joy. But in your outward life you will be ever more aggressive and irascible, more quick-tempered and fretful. These are the signs of a person who is deluded.
A guide must be a person who is experienced in the prayer of the heart. It cannot be someone who prays mechanically and has not experienced prayer with the grace of God. Such a person will only be able to tell you what he has read in books.
A spiritual guide will keep you out of danger of delusion.
The Saint advises,
This is the teaching. We say that prayer cannot be taught, but in point of fact it can be taught when you live with someone who truly prays. When you take a book about prayer and read it, it may be that you don't understand anything. But when you have an elder next to you who prays, whatever he tells you about prayer you understand and take to heart.
Saint Porphyrios
Reference: Wounded By Love, pp 124 - 126
The Lord called on a sinful soul to repent, and it turned to Him. Then He mercifully accepted it and revealed Himself to it because He is merciful, humble and meek. In His infinite mercy He did not mention the soul’s sins, and the soul loved Him without end, and was drawn to Him like a caged bird to a green wood.
Suddenly the soul loses the Lord’s grace and wonders how it insulted the Lord. "I will ask for forgiveness, and perhaps He will once again give me His grace, for my soul wishes for nothing else in this world except the Lord," thinks a person, for the love of the Lord is so warming, that if a soul should taste it — it would desire nothing else; and if it should lose it, or if grace should dissipate, then what prayers would a soul not utter in order to return the Lord’s grace to it?
When a soul lives in the Holy Spirit, then it is joyful and does not pine for the heavens, because it feels the Kingdom of God within itself: the Lord has come and abides within it. But when it loses grace, then it begins to pine for heaven and tearfully seeks out the Lord.
Whoever has not felt grace cannot know what it is to desire it. Most people have become attached to the worldly, and they cannot understand that nothing worldly could ever take the place of the Holy Spirit. The Lord takes His grace from the soul and in this manner mercifully and wisely teaches it to be humble, for it was for the soul that He spread His arms on the Cross with such great suffering. He gives the soul the ability to struggle against our enemies, but the soul by itself is powerless to achieve victory; for this reason it is said, "Ask, and ye shall receive." And if we do not ask, then we but torment and rob ourselves of the grace of the Holy Spirit, without which the soul remains confused, because it cannot see the will of God.
Here is the shortest and easiest path to salvation: Be obedient and temperate, do not judge and keep your mind and heart free of evil thoughts; believe instead that all people are kind and that God loves them. For these humble thoughts the grace of the Holy Spirit will live within you, and you will say, "God is merciful."
It brings the Lord joy to see a humbly penitent soul, and He brings the grace of the Holy Spirit to it. I know how one novice received the Holy Spirit after only a half-year in a monastery; others received the Holy Spirit after ten years; and yet others live for forty and more years before they experience grace. But none of them could retain grace, because we are not humble.
Saint Serafim was 27 years old, when he saw the Lord, and his soul loved God so, that the sweetness of the Holy Spirit changed him entirely. But when he later went to a deserted area and saw that he no longer carried that grace, he stood for three years on a rock and cried, "Lord have mercy on me, a sinner."
Blessed is he who does not lose the grace of God, but rises from strength to strength. I have lost grace, but the Lord has felt great pity for me and allowed me to taste an even greater one in His mercy. Brothers, with all your strength, humble your souls, so that the Lord will love them and bestow His mercy upon them. But we cannot hope for mercy if we do not love our enemies.
Saint Silouan the Athonite
Excessive care about worldly matters is characteristic of an unbelieving and fainthearted person, and woe to us, if, in taking care of ourselves, we do not use as our foundation our faith in God, who cares for us! If we do not attribute visible blessings to Him, which we use in this life, then how can we expect those blessings from Him which are promised in the future? We will not be of such little faith. By the words of our Saviour, it is better first to seek the Kingdom of God, for the rest shall be added unto us (see Mt. 6:33).
Saint Seraphim of Sarov
