John Piper looks at the ways we could slip into evil and how we can ask God to keep us from them.
Psalm 141:1-4 ESV
1 O Lord, I call upon you; hasten to me!
Give ear to my voice when I call to you!
2 Let my prayer be counted as incense before you,
and the lifting up of my hands as the evening sacrifice!
3 Set a guard, O Lord, over my mouth;
keep watch over the door of my lips!
4 Do not let my heart incline to any evil,
to busy myself with wicked deeds
in company with men who work iniquity,
and let me not eat of their delicacies!