Mark 9:25: Jesus omnipotent to heal

Jesus omnipotent to heal,
Thine utmost power exert,
And for Thy mercy sake expel
The fiend out of my heart:
Tormented by this spirit unclean
For help Divine I groan,
This Belial of indwelling sin
Will yield to God alone.

But if I can believe in Thee
My kind almighty Lord,
Impossibilities shall be
Accomplish'd by Thy word:
I do imperfectly believe,
Do Thou my doubts remove,
And help my weakness to receive
The holiness of love.

The same in every age Thou art.
Replete with grace and power
Command the demon to depart.
And never enter more.
And never more pollute my breast,
Disburden'd of its load,
By perfect purity possess'd.
For ever fill'd with God.