Matthew 26:70: He denied before them all

This dire concupiscence within
Which tempts me to the treacherous sin,
Saviour I always feel,
The darkness of my carnal mind
Which casts Thy benefits behind,
The weakness of my will.

My memory. Lord, cannot retain
Ten thousand vows renew'd in vain,
Ten thousand promises:
Tempted I shall Thyself deny,
Unless Thou giv'st me to rely
On Thine almighty grace.

But if Thy grace my soul defend,
But if I on Thy grace depend,
With bold fidelity
I shall to all Thy foes maintain.
To all the world, I know the Man
Who lived and died for me.