Of Prayer, by John Calvin, tr. Henry Beveridge [1845], at sacred-texts.com
We must now attend not only to a surer method, but also form of prayer, that, namely, which our heavenly Father has delivered to us by his beloved Son, and in which we may recognize his boundless goodness and condescension (Matthew 6:9; Luke 11:2). Besides admonishing and exhorting us to seek him in our every necessity (as children are wont to betake themselves to the protection of their parents when oppressed with any anxiety), seeing that we were not fully aware how great our poverty was, or what was right or for our interest to ask, he has provided for this ignorance; that wherein our capacity failed he has sufficiently supplied. For he has given us a form in which is set before us as in a picture everything which it is lawful to wish, everything which is conducive to our interest, everything which it is necessary to demand. From his goodness in this respect we derive the great comfort of knowing, that as we ask almost in his words, we ask nothing that is absurd, or foreign, or unseasonable; nothing, in short, that is not agreeable to him. Plato, seeing the ignorance of men in presenting their desires to God, desires which if granted would often be most injurious to them, declares the best form of prayer to be that which an ancient poet has furnished: "O king Jupiter, give what is best, whether we wish it or wish it not; but avert from us what is evil even though we ask it" (Plato, Alcibiad. ii). This heathen shows his wisdom in discerning how dangerous it is to ask of God what our own passion dictates; while, at the same time, he reminds us of our unhappy condition in not being able to open our lips before God without dangers unless his Spirit instruct us how to pray aright (Romans 8:26). The higher value, therefore, ought we to set on the privilege, when the only begotten Son of God puts words into our lips, and thus relieves our minds of all hesitation.