Psalms 58:9

The psalmist believed their destruction would be swift. Thorns used for firewood burn very quickly. David compared the unjust rulers to thorns. Their fiery evil would not last long enough to effect any change on the pot above them, a figure for other people whom they might influence. Regardless of whether these wicked men were young (green) or old (dry), their influence would be minimal because God would judge them.