The Holy Sonnets of John Donne, Op. 35: Sonnet XIX: Oh, to vex me

Oh, to vex me, contraryes meet in one:
In constancy unnaturally hath begott
A constant habit; that when I would not
I change in vowes, and in devotione.
As humorous is my contritione
As my profane Love and as soone forgott:
As ridlingly distemper’d, cold and hott,
As praying, as mute; as infinite, as none.
I durst not view Heav’n yesterday; and today
In prayers, and flatt’ring speeches I court God:
Tomorrow I quake with true feare of his rod.
So my devout fitts come and go away,
Like a fantastique Ague: save that here
Those are my best dayes, when I shake with feare.