_S. Augustine: I have cried with my whole heart, hear me, O Lord!_[207] Who can question but that when men pray their cry to the Lord is vain if it be nought but the sound of the corporeal voice and their heart be not intent upon God? But if their prayer come from the heart, then, even though the voice of the body be silent, it may be hidden from all men, yet not from God. Whether, then, we pray to God with our voice--at times when such prayer is necessary--or whether we pray in silence, it is our heart that must send forth the cry. But the heart's cry is the earnest application of our minds. And when this accompanies our prayer it expresses the deep affections of him who yearns and asks and so despairs not of his request. And further, a man cries _with his whole heart_ when he has no other thought. Such prayers with many are rare; with few are they frequent; I know not whether anyone's prayers are always so (_Enarr. in Ps._ cxviii., _Sermon_, xxix. 1). "Incline Thy ear, O Lord, and hear me; for I am needy and poor. Preserve my soul, for I am holy: save Thy servant, O my God, that trusteth in Thee. Have mercy on me, O Lord, for I have cried to Thee all the day. Give joy to the soul of Thy servant, for to Thee, O Lord, I have lifted up my soul. For Thou, O Lord, art sweet and mild; and plenteous in mercy to all that call upon Thee."[208] XIII Must Prayer necessarily be Attentive? That even holy men sometimes suffer distraction of mind when at prayer is clear from the words: _My heart hath forsaken me!_[209] This question particularly concerns vocal prayer. And for its solution we must know that a thing is said to be necessary in two senses: firstly, in the sense that by it a certain end is _more readily_ attained, and in this sense attention is absolutely requisite in prayer. But a thing is said to be necessary also because without it a certain thing cannot attain its object _at all_. Now the effect or object of prayer is threefold. Its first effect--an effect, indeed, which is common to all acts springing from charity--is _merit_; but to secure this effect it is not necessarily required that attention should be kept up throughout the prayer, but the initial intention with which a man comes to prayer renders the whole prayer meritorious, as, indeed, is the case in all other meritorious acts. The second effect of prayer is peculiar to it, and that is to _obtain favours_; and for this, too, the primary intention suffices, and to it God principally looks. But if the primary intention is wanting, prayer is not meritorious, neither can it win favours; for, as S. Gregory says, God hears not the prayer of a man who when he prays does not give heed to God.[210]