For this reason we must first beg of God with struggle in the heart through faith that he grant us to discover his riches, the true treasure of Christ in our hearts, in the power and energy of the Spirit. In such a way, first, by finding the Lord to be our help within us and our salvation and eternal life, we may be of help and profit to others also, insofar as it is possible and attainable, by drawing upon Christ, the treasure within, for all goodness of spiritual discourses and in teaching the heavenly mysteries.
Thus the goodness of the Father was pleased to wish to dwell in every believer who asks this of him. Christ says: “He that loves me, he will be loved by my Father and I will love him and I will manifest myself to him.” (Jn 14.21). And again: “I and my Father will come and make our mansion in him” (Jn14.23)
Thus the infinite kindness of the Father decreed; thus the incomprehensible love of Christ was pleased. Thus the ineffable good of the promised Spirit. Glory to the ineffable compassion of the Holy Trinity.
Those, who have deemed worthy to become children of God and to be reborn by the Holy Spirit from above, who have within themselves Christ, illuminating and bringing them rest, are guided in many and various ways by the Spirit. They are invisibly acted upon in the heart, in the spiritual tranquility, by grace.
St. Macarius the Great, Homilies 18.6, 7, in Maloney, Intoxicated with God: The Fifty Spiritual Homilies of Macarius.