I ASK good things that I detest,
With speeches fair;
Heed not, I pray Thee, Lord, my breast,
But hear my prayer.

I say ill things I would not say -
Things unaware:
Regard my breast, Lord, in Thy day,
And not my prayer.

My heart is evil in Thy sight:
My good thoughts flee:
O Lord, I cannot wish aright -
Wish Thou for me.

O bend my words and acts to Thee,
However ill,
That I, whate'er I say or be,
May serve Thee still.

O let my thoughts abide in Thee
Lest I should fall:
Show me Thyself in all I see,
Thou Lord of all.

Robert Louis Stevenson

http://www.poemhunter.com/poem/prayer-6/