Charles Spurgeon Commentary 2 Samuel 7:27

"For thou, O Jehovah of hosts, the God of Israel, hast revealed to thy servant, saying, I will build thee a house: therefore hath thy servant found in his heart to pray this prayer unto thee." — 2 Samuel 7:27 (ASV)

Hast revealed to thy servant, saying, I will build thee an house: therefore hath thy servant found in his heart to pray this prayer unto thee.

That is the best place to find a prayer—in your heart. No prayer comes up before God with acceptance, except that which comes out of the very heart. The heart should be like the sacred ark of old, in which Israel's most precious things were hidden. God's words had gone right down into David's heart, and touched its secret springs, and now they welled up in this blessed prayer.