1 Corinthians 14:15
"What is it then? I will pray with the spirit, and I will pray with the understanding also: I will sing with the spirit, and I will sing with the understanding also."
Cross References (ranked by relevance)
Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord.
Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints;
But ye, beloved, building up yourselves on your most holy faith, praying in the Holy Ghost,
For God is the King of all the earth: sing ye praises with understanding.
Yet in the church I had rather speak five words with my understanding, that by my voice I might teach others also, than ten thousand words in an unknown tongue.
But if our unrighteousness commend the righteousness of God, what shall we say? Is God unrighteous who taketh vengeance? (I speak as a man)
What say I then? that the idol is any thing, or that which is offered in sacrifice to idols is any thing?
For God is my witness, whom I serve with my spirit in the gospel of his Son, that without ceasing I make mention of you always in my prayers;
What then? notwithstanding, every way, whether in pretence, or in truth, Christ is preached; and I therein do rejoice, yea, and will rejoice.
What shall we then say to these things? If God be for us, who can be against us?