Analysis of Oh my blacke Soule! now thou art summoned

Oh my black Soule! Now thou art summoned
By sicknesse, deaths herald, and champion;
Thou art like a pilgrim, which abroad hath done
Treason, and durst not turne to whence hee is fled,
Or like a thiefe, which till deaths doome be read,
Wisheth himselfe deliverd from prison;
But damn'd and hal'd to execution,
Wisheth that sill he might be imprisioned;
Yet grace, if thou repent, thou canst not lacke;
But who shall give thee that grace to beginne?
Oh make thy selfe with holy mourning blacke;
And red with blushing, as thou art with sinne;
Or wash thee in Christ's blood, which hath this might
That being red, it dyes red soules to white.