For your Father knoweth This single remedy is sufficient for removing and destroying the superstition which is here condemned. For whence comes this folly of thinking that great advantage is gained, when men weary God by a multiplicity of words, but because they imagine that he is like a mortal man, who needs to be informed and solicited? Whoever is convinced, that God not only cares for us, but knows all our wants, and anticipates our wishes and anxieties before we have stated them, will leave out vain repetitions, and will reckon it enough to prolong his prayers, as far as shall be necessary for exercising his faith; but will reckon it absurd and ridiculous to approach God with rhetorical embellishments, in the expectation that he will be moved by an abundance of words. But if God knows what things we have need of, before we ask him, where lies the advantage of prayer? If he is ready, of his own free will, to assist us, what purpose does it serve to employ our prayers, which interrupt the spontaneous course of his providence? The very design of prayer furnishes an easy answer. Believers do not pray, with the view of informing God about things unknown to him, or of exciting him to do his duty, or of urging him as though he were reluctant. On the contrary, they pray, in order that they may arouse themselves to seek him, that they may exercise their faith in meditating on his promises, that they may relieve themselves from their anxieties by pouring them into his bosom; in a word, that they may declare that from Him alone they hope and expect, both for themselves and for others, all good things. God himself, on the other hand, has purposed freely, and without being asked, to bestow blessings upon us; but he promises that he will grant them to our prayers. We must, therefore, maintain both of these truths, that He freely anticipates our wishes, and yet that we obtain by prayer what we ask. As to the reason why he sometimes delays long to answer us, and sometimes even does not grant our wishes, an opportunity of considering it will afterwards occur.

Your Father knoweth what things ye have need of - Prayer is not designed to inform God, but to give man a sight of his misery; to humble his heart, to excite his desire, to inflame his faith, to animate his hope, to raise his soul from earth to heaven, and to put him in mind that There is his Father, his country, and inheritance.
In the preceding verses we may see three faults, which our Lord commands us to avoid in prayer: -
1st. Hypocrisy. Be not as the hypocrites. Matthew 6:5.
2ndly. Dissipation. Enter into thy closet. Matthew 6:6.
3rdly. Much Speaking, or Unmeaning Repetition, Be not like the heathens. Matthew 6:7.

Be not ye therefore like unto them,..... Do not be imitators of them, and follow their ways, who have only the dim light of nature to guide them; it would be shameful in you to do as they do, when you have a divine revelation for your direction; and especially, because
your Father knoweth what things ye have need of before ye ask him; and therefore have no need to make use of many words, or much speaking, or long prayers. The omniscience of God is a considerable argument, and a great encouragement to prayer; he knows our persons and our wants before hand; and as he is able to help us, we have reason to believe he will; especially since he stands in the relation of a Father to us.

Be not ye therefore like unto them: for your Father knoweth what things ye have need of before ye ask him--and so needs not to be informed of our wants, any more than to be roused to attend to them by our incessant speaking. What a view of God is here given, in sharp contrast with the gods of the heathen! But let it be carefully noted that it is not as the general Father of mankind that our Lord says, "Your Father" knoweth what ye need before ye ask it; for it is not men, as such, that He is addressing in this discourse, but His own disciples--the poor in spirit, the mourners, the meek, hungry and thirsty souls, the merciful, the pure in heart, the peacemakers, who allow themselves to have all manner of evil said against them for the Son of man's sake--in short, the new-born children of God, who, making their Father's interests their own, are here assured that their Father, in return, makes their interests His, and needs neither to be told nor to be reminded of their wants. Yet He will have His children pray to Him, and links all His promised supplies to their petitions for them; thus encouraging us to draw near and keep near to Him, to talk and walk with Him, to open our every case to Him, and assure ourselves that thus asking we shall receive--thus seeking we shall find--thus knocking it shall be opened to us.

For your Father knoweth. Here is given abundant reason for short prayers. Many prayers apparently aim to give God information on matters connected with this world.

Your Father knoweth what things ye have need of - We do not pray to inform God of our wants. Omniscient as he is, he cannot be informed of any thing which he knew not before: and he is always willing to relieve them. The chief thing wanting is, a fit disposition on our part to receive his grace and blessing. Consequently, one great office of prayer is, to produce such a disposition in us: to exercise our dependence on God; to increase our desire of the things we ask for; to us so sensible of our wants, that we may never cease wrestling till we have prevailed for the blessing.