וַיֹּ֤אמֶר נָתָן֙ אֶל־הַמֶּ֔לֶךְ כֹּ֛ל אֲשֶׁ֥ר בִּֽלְבָבְךָ֖ לֵ֣ךְ עֲשֵׂ֑ה כִּ֥י יְהוָ֖ה עִמָּֽךְ׃ (ס)
And Nathan said to the king: ‘Go, do all that is in thy heart; for the LORD is with thee.’
Read kabbalistic (mystical) interpretation of II Samuel 7:3: and classical mystical sources.