1. Myself, to wit, my body. So it is a double synecdoche. And the soul is so taken Psa_16:10. Or,
2. My soul properly so called; which is said to be healed, when it is pardoned and purged, as 2Ch_30:20Isa_53:5, compared with 1Pe_2:24Mat_13:15, compared with Mar_4:12Jam_5:16. So he strikes at the root of his misery, and prays for the removal of the sin of his soul, as the cause of the disease of his body.
For I have sinned against thee: this may be added, either,
1. As a reason or motive to God; Grant this request, for I have sinned, and therefore thy grace in healing me will be more glorious and admirable. Or, for I acknowledge that I have sinned; for the act is oft put for the declaration of it, as Exo_33:13Psa_51:5. Or,
2. As a reason moving him thus to pray, I said, Lord, be merciful unto me: heal my soul; and great reason I had to say so, for I have sinned against thee.