"Early in the morning it rises, sits upon a twig and sings a song it has learned, while it knows not where to obtain its food, and yet it is not worried as to where to get its breakfast. Later, when it is hungry, it flies away and seeks a grain of corn, where God stored one away for it, of which it never thought while singing, when it had cause enough to be anxious about its food. Ay, shame on you now, that the little birds are more pious and believing than you; they are happy and sing with joy and know not whether they have anything to eat." Sermons of Martin Luther, 8 vols., ed. John Nicholas Lenker, Grand Rapids: Baker Book House, 1983, V, p. 114. Trinity 15 Matthew 6:24-34
"This doctrine concerning the inability and wickedness of our natural free will and concerning our conversion and regeneration, namely, that it is a work of God alone and not of our powers, is [impiously, shamefully, and maliciously] abused in an unchristian manner both by enthusiasts and by Epicureans; and by their speeches many persons have become disorderly and irregular, and idle and indolent in all Christian exercises of prayer, reading and devout meditation; for they say that, since they are unable from their own natural powers to convert themselves to God, they will always strive with all their might against God, or wait until God converts them by force against their will; or since they can do nothing in these spiritual things, but everything is the operation of God the Holy Ghost alone, they will regard, hear, or read neither the Word nor the Sacrament, but wait until God without means..."
Formula of Concord, Free Will, 46, Triglotta, p. 899.
"The Christian's faith trusts in the ordinary means. Prayer is not a means of grace. Means of grace are divine appointments through which God uniformly offers blessings to all who use them. Faith is the means by which the blessings are received and appropriated. God gives us bread, when we ask it, not through the channel of prayer, but through the ordinary channels of His providence. He gives us grace when we ask it, not through prayer, but through the ordinary means appointed for this end, namely the Word and Sacraments. He who despises these will as little have grace as he who refuses to accept bread produced in the ordinary way of nature. Faith asks with confidence, and trusts in the ordinary means of God's appointment for the blessings asked." Matthias Loy, Sermons on the Gospels, p. 387.
"Prayer is made vigorous by petitioning; urgent, by supplication; by thanksgiving, pleasing and acceptable. Strength and acceptability combine to prevail and secure the petition." Sermons of Martin Luther, 8 vols., VI, p. 107. Philippians 4:4-7.
"The Lord's Prayer opens with praise and thanksgiving and the acknowledgement of God as a Father; it earnestly presses toward Him through filial love and a recognition of fatherly tenderness. For supplication, this prayer is unequaled. Hence it is the sublimest and the noblest prayer ever uttered." Sermons of Martin Luther, 8 vols., VI, p. 107. Philippians 4:4-7; Matthew 6:9-13.
"In like manner, St. Paul says that God's ability is thus proved, in that He does exceeding abundantly above and better than we ask or think. Ephesians 3:20. Therefore, we should know we are too finite to be able to name, picture or designate the time, place, way, measure and other circumstances for that which we ask of God. Let us leave that entirely to Him, and immovably and steadfastly believe that He will hear us." Sermons of Martin Luther, 8 vols., III, p. 179f. Ephesians 3:20.
"Only begin this [prayer, self-examination], I say, and see how you will succeed in the task; and you will soon discover what an unbelieving knave is hidden in your bosom, and that your heart is too dull to believe it." Sermons of Martin Luther, 8 vols., II, p. 257. Mark 16:1-8.