What Jesus was warning about
In the Sermon on the Mount, Jesus cautioned against using empty, wordy prayer in the way some Gentiles did. They assumed that more words would make their gods pay attention. Jesus points his disciples in a different direction: their Father already knows what they need before they ask him (Matthew 6:7-8).
So the problem is not a repeated phrase, a written prayer, or praying a familiar prayer each morning. The problem is treating prayer like a formula, as if the right number of words could control God. Prayer is relationship, not a spell.
But when ye pray, use not vain repetitions, as the heathen do: for they think that they shall be heard for their much speaking.
Jesus himself prayed again
On the night before the cross, Jesus prayed in Gethsemane under crushing sorrow. Matthew records that he returned to pray again, using the same words (Matthew 26:44). His repeated request was not empty. It was deeply personal, honest, and surrendered to the Father's will.
That moment gives permission to bring the same grief, hope, or question to God more than once. If you are praying for a sick friend, a strained marriage, guidance about work, or strength for today, you do not need to invent new wording each time. God is not bored by a child who keeps coming to him.
And he left them, and went away again, and prayed the third time, saying the same words.
Keep praying without pretending
Jesus also told a parable so that his disciples would understand they should keep praying and not lose heart (Luke 18:1). Persistent prayer is not trying to wear God down. It is a way of continuing to depend on him when the answer has not yet come.
Still, repetition can become automatic. You may notice yourself rushing through familiar words while your mind is elsewhere. When that happens, there is no need for shame. Pause. Say simply what is true: "Lord, I am tired", or "Help me trust you." God welcomes honest prayer.
And he spake a parable unto them to this end, that men ought always to pray, and not to faint;
Let familiar words lead you to God
Some repeated prayers can steady a wandering heart. The Psalms repeatedly call people to give thanks because God's goodness and mercy endure (Psalm 136:1). Those words were not empty when they were spoken with remembrance and gratitude. Repetition can help truth sink in.
You might pray the Lord's Prayer regularly, return to a psalm in a hard season, or repeat a short request throughout the day. Keep bringing your real self to God. As Paul encouraged the Philippians, bring every concern to God with prayer, supplication, and thanksgiving (Philippians 4:6). Familiar words are good servants when they help you trust the One you are speaking to.