Look on him whom you have pierced, and let it trouble you. Say to your soul, “What have I done? What love, what mercy, what blood, what grace have I despised and trampled on! Is this how I pay back the Father for his love? Is this how I thank the Son for his blood? Is this how I respond to the Holy Spirit for his grace? Have I defiled the heart that Christ died to wash, and the Holy Spirit has chosen to dwell in? How can I keep myself out of the dust? What can I say to the dear Lord Jesus? How shall I hold up my head with any boldness before him? Do I count fellowship with him of so little value that, for this vile lust’s sake, I have hardly left any room in my heart? How shall I escape if I neglect so great salvation?”
What shall I say to the Lord? His love, mercy, grace, goodness, peace, joy, consolation – I have despised all of them! I have considered them as nothing, that I might harbor lust in my heart. Have I seen God as my Father, that I might provoke him to his face? Was my soul washed that there might be room for new defilements? Shall I seek to disappoint the purpose of the death of Christ? Shall I grieve the Holy Spirit, who sealed me unto the day of redemption?
Allow your conscience to consider these things every day.
From The Mortification of Sin.