I ought to add something.
In the months before I began seeking to enter Holy Orthodoxy, as a Catholic, I developed a devotion to the Sacred Heart.
I no longer practice that devotion. But I would imagine that if the sentimentality and imagery could be removed from it, it would perhaps be useful.
What would be left of it? What would it be? That is an honest question.
It might look something like this:
O Sacred Heart of Jesus! Living and life-giving fountain of eternal life, infinite treasure of the Divinity, glowing furnace of love. Thou art my refuge and my sanctuary. O my adorable and loving Saviour, consume my heart with that fire wherewith Thine is ever inflamed; pour from Thy love, and let my heart be so united with Thine that my will may be conformed to Thine in all things. Amen.
O Most loving Lord Jesus, who dost invite me to give Thee my heart, and hast commanded me to love Thee with my whole soul; I most earnestly desire to do Thy will. For whom have I in heaven but Thee? and there is none upon earth that I desire in comparison of Thee. For Thee my heart and flesh faileth, Thou art the God of my strength and my portion for ever. Thou art the fount of all love; and Thy banner over me is love. Thou hast thought of me from all eternity; Thou hast created me, and redeemed me, and dost guard and keep me day by day. O most loving Lord, can it be that such wonderful love should not move me to such poor return as I can make Thee? Yes, Lord, I will love Thee, because Thou didst first love me. I will try to love Thee as Thou hast commanded, with all my heart, with all my mind, and with all my soul, and with all my strength. I would that henceforth neither tribulation, nor distress, nor persecution, nor life, nor death, nor any created thing should separate me from Thee. Quench then by Thy Holy Spirit all love of the world and myself, enable me to bear Thy sweet yoke, that I may learn of Thee to be meek and lowly of heart. Make me to realize my own nothingness, that I may learn to esteem others better than myself. O meek and humble Heart of my Jesus! O Heart of love, teach me to love Thee now and through all eternity. Amen.
This was taken from the popular St. Ambrose Western Orthodox prayer book. The introduction to this devotion says, "The Western Orthodox use of this devotion is directed to the compassion of Jesus Christ, represented by His Sacred Heart. The devotion does parallel the Eastern Rite devotion found in The Akathist to the Sweetest Lord Jesus, which has been popular among Eastern Christians for centuries. It is not a devotion to a specific physical organ and body part, anymore than when we say of ourselves, "My heart within me is troubled," but to Our Lord's compassionate love for us. The heart has long been taken to be the symbolic seat of love and the Heart of Jesus reveals the fundamental fact of Christianity that God loves us. Devotion to the Sacred Heart bestows a deeper insight into the Divine love and a surer confidence in it. As we see something of God's love, we shall want to make a return in terms of love and this devotion enables us to express the love of our own hearts."