Here is the clearest recognition on Isaac’s part that Jacob is the promised seed. The blessing of God is going to come through Jacob however much Isaac feels drawn to Esau, and now Isaac is prepared to acknowledge it.
God is able to bless us with solid joy that the corruption of this world cannot eat away at. Already in this life the believer possesses that treasure in heaven which is beyond the reach of moth or rust and is kept for us where thieves cannot break in and steal.