Ante-Nicene Fathers, Vol III: Tertullian: Part III: We Ma...
Chapter X.—We May Superadd Prayers of Our Own to the Lord’s Prayer.
Since, however, the Lord, the Foreseer of human necessities, 8824 said separately, after delivering His Rule of Prayer, “Ask, and ye shall receive;” 8825 and since there are petitions which are made according to the circumstances of each individual; our additional wants have the right—after beginning with the legitimate and customary prayers as a foundation, as it were—of rearing an outer superstructure of petitions, yet with remembrance of the Master’s precepts.
See Matt. vi. 8.
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