Prayer is the only way I know of increasing capacity. Once one has the capacity for receptivity, it is filled; we will receive unless we willfully won't allow it. It is when the channel of communion is broken by us, that God's love is unable to flow. Tell your friend to pray more, with greater sincerity and unyielding faith.
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144:4.2 The earnest and longing repetition of any petition, when such a prayer is the sincere expression of a child of God and is uttered in faith, no matter how ill-advised or impossible of direct answer, never fails to expand the soul's capacity for spiritual receptivity.
144:4.4 Prayer led Jesus up to the supercommunion of his soul with the Supreme Rulers of the universe of universes. Prayer will lead the mortals of earth up to the communion of true worship. The soul's spiritual capacity for receptivity determines the quantity of heavenly blessings which can be personally appropriated and consciously realized as an answer to prayer.
146.2.14 Jesus never taught that human knowledge and special skill could be gained by prayer. But he did teach that prayer is a factor in the enlargement of one’s capacity to receive the presence of the divine spirit. When Jesus taught his associates to pray in the spirit and in truth, he explained that he referred to praying sincerely and in accordance with one’s enlightenment, to praying wholeheartedly and intelligently, earnestly and steadfastly.
194.3.20 Prayer did not bring the spirit on the day of Pentecost, but it did have much to do with determining the capacity of receptivity which characterized the individual believers. Prayer does not move the divine heart to liberality of bestowal, but it does so often dig out larger and deeper channels wherein the divine bestowals may flow to the hearts and souls of those who thus remember to maintain unbroken communion with their Maker through sincere prayer and true worship.
Although there's one instance when prayer may not necessarily satisfy:
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168.4.6 3. The prayers of time, when indited by the spirit and expressed in faith, are often so vast and all-encompassing that they can be answered only in eternity; the finite petition is sometimes so fraught with the grasp of the Infinite that the answer must long be postponed to await the creation of adequate capacity for receptivity; the prayer of faith may be so all-embracing that the answer can be received only on Paradise.