That the heart may be pure, a generous mortification is prescribed: "If thy right eye scandalize thee, pluck it out. . . . If thy right hand scandalize thee, cut it off." (Matt 5:29) We must particularly watch over purity of intention: for example, not giving alms through ostentation, not praying to draw upon ourselves the esteem of men, but seeking only the approbation of "the Father who seeth in secret." Then will be realized the words of the Master: "If thy eye be single, thy whole body shall be lightsome." (Matt 6:22)
Even here on earth, the Christian will, in a sense, see God in his neighbor, even in souls that at first seem opposed to God. The Christian will see God in holy Scripture, in the life of the Church, in the circumstances of his own life, and even in trials, in which he will find lessons on the ways of Providence as a practical application of the Gospel. Under the inspiration of the gift of understanding, this is the true contemplation which prepares us for that by which, properly speaking, we shall see God face to face, His goodness, and His infinite beauty. Then all our desires will be gratified, and we shall be inebriated with a torrent of spiritual delights.
The Three Ages of the Interior Life, Garrigou Lagrange