The answer given by God to Solomon’s prayer is reported more fully in 2 Chronicles 7:12-22.
When God puts His Name in the temple He does it, in intention, “forever.” He will not arbitrarily withdraw it; there it will remain “forever,” so far as God is concerned. But the people may by unfaithfulness drive it away 1 Kings 9:7-9.
And mine eyes and my heart - An answer in excess of the prayer 1 Kings 8:29; “Not Mine eyes only, but Mine eyes and Mine heart.”