In Matthew 6, Jesus is saying fundamentally, prayer is communication between a safe, secure, fully loved and accepted child and her heavenly Father. So, if we know the Father knows what we need beforehand, why should we ask? What's at the heart of prayer?
Unlike the many pagan gods, who might be manipulated and appeased by many words, the Father's love is perfect and complete. He longs for us. So we're asked to come before him knowing he already knows all our needs.
And our own sense of need may not be what we actually need. Often I'm caught up in petitions that really aren't the point. Apart from all the many sources of anxiety which often populate my prayer, perhaps the true need is to simply be in his presence ... in silence and solitude.
Prayer is closing the door on those distractions to be with the Father. The chapter ends with addressing our disordered way of striving through life, anxious and fearful of lack ... "What shall we eat? or 'What shall we drink? or What shall we wear?' For the pagans run after all these things (those who are hooked in the bondage of sin and death and have no sense of being loved by the ONE TRUE Heaven Father ... even heretical attempts at distorting God's heavenly FATHERHOOD as mere misogynistic Patriarchy). He repeats, "Your heavenly Father knows that you need them. The mission of Jesus was to show us the FATHER. Heavenly Patriarchy brings freedom to the captives.
BUT seek first his kingdom (the Father's Kingdom) and his righteousness (alms, prayer, fasting as a means), and all these things will be given to you as well. It doesn't say don't seek them, don't attend to them ... but priorities them under God's Reign. First of all, seek God then attend, in communion with Him, the issues of life.
He knows you need them but do we know that we need HIM far more than such needs? Look at your priorities and you'll know the answer.
Therefore do not worry about tomorrow, for tomorrow will worry about itself. Each day has enough trouble of it's own.
Jesus is saying prioritize your life or your life will be disordered and filled with anxiety. Jesus is not saying never plan or think about the future ... short and long term planning is essential. He says take no ANXIOUS thought about tomorrow ... don't let your thoughts entertain worry and fear ... DELIVER us from evil ...
So, in light of knowing we are beloved children of a loving Father who already knows our true need - reconciliation with God and humanity - he says that we should pray ...
OUR FATHER in heaven ... prayer is secret is never alone ...
Bonhoeffer, p. 77 Let him who cannot be alone beware of community ... Let him who is not in community beware of being alone. (Life Together)
Silence and Solitude is the soil condition for receiving the Word implanted.