An heart that deviseth wicked imaginations, feet that be swift in running to mischief,
– Proverbs 6:18
Devising wicked imaginations is to plan evil schemes. The evil man does this continually (Proverbs 6:14). The heart is often put for the mind and the will. It is deceitful (Proverbs 12:20) and brings forth all manner of sin (Mark 7:21-22). Being swift to run means quickly or easily going to mischief, or to cause calamity. This is another mark of the evil man (Proverbs 6:13). It speaks of a bent toward this and even a zeal in that direction. Again, God hates these things.