WHO ARE THE SERVANTS (EDUCATORS) OF PRAYER?

All of us who believe , pray and lead others to pray are indeed "servants of prayer". The Christian family is the first place of education in prayer where children learn to pray "as the Church" and  to persevere in prayer. Ordained ministers (Priests and Deacons) are also responsible for the formation in prayer of their brothers and sisters in Christ. They lead the People of God to the living waters of prayer: the Word of God , the liturgy, the theological life (the life of faith, hope, and charity). Many have consecrated their whole lives to prayer. Hermits, monks, and nuns, since the time of the desert fathers, have devoted their time to praising God and interceding for his people.The Catechesis for children, young people, and adults aims at teaching them to meditate on The Word of God in personal prayer, practicing it in liturgical prayer, and internalizing it at all times in order to bear fruit in a new life.
Prayer groups, indeed "schools of prayer." are today one of the signs and one of the driving fources of  renewal of prayer in the Church. Above all, it is the Holy Spirit who guides and animates the believer in prayer.

WHAT IS THE ROLE OF THE HOLY SPIRIT IN PRAYER?

Since the Holy Spirit is the interior Master of Christian prayer and "we do not know how to pray as we ought" (Romans 8:26), the Church exhorts us to invoke him and  implore him on every occasion: "Come, Holy Spirit!" The Holy Spirit gives sweetness in believing (faith) and leads us into a personal communion with God. He guides us and teaches us how to pray. [ See CCC 2690]


Please explain the 'the gifts of knowledge' and if it is okay to allow who has this goft to pray over you and give you the message he receives.

The gifts of knowledge is not a gift for scientific civil studies of mathematics, or languages, or any other subject. It is only "to know" , i.e., to understand better the Word of God and its implication in our present life.It is a gift that is linked with anothr gift, the gift of Wisdom. Anybody can pray over you or over me or over any other person. But, we should be very skiptical about "the message they receive". Many times the Holy Spirit has nothing to do with that the person seems or assumes to receive from  him. Even though the the Holy Spirit can speak to somebody in many ways, even by private inspiration, the Holy Spirit normally conveys his messages through the Church (by Word of God, through the Sacraments, Liturgy, and prayer).When somebody tells you that his message comes from the Holy Spirit, please don't readily believe it.A discernment of the spirit is always necessary in these cases. [ See CCC 2690] 

                How can we discern if one is animated by a good or an evil spirit?

Generally one of the three spirit is Dominant in every soul: in perverse, the devil; in the tepid,the natural (worldly) spirit; and in those who are beginning to give themselves seriously to interior conversion and prayer, the Spirit of God habitually dominates. The great principles of the discerning of spirits was given to us by our Lord himself in the Gospel when he said: "Beware of false prophets, who come to you in the clothing of sheep, but inwardly they are ravening wolves. By their fruits you shall know them..."(see Mt 7:15-18)if we are prone to wicked or worldly ways, we can ask God to restore his Spirit within us. "A clean heart create for me, God; renew in me a steadfast spirit. Do not drive me from your presence, nor take from me your holy spirit. Restore in your salvation; sustain in me a willing spirit"