As vinegar to the teeth, and as smoke to the eyes, so is the sluggard to them that send him.
– Proverbs 10:26
The vinegar and smoke mentioned are both irritants. Smoke in the eyes when trying to work to get something done can be frustrating. A sluggard is an indolent, lazy person. The sluggard is one of the recurring characters throughout Proverbs. When a sluggard is employed or otherwise relied on to accomplish something, it is an exasperating experience.