Most concepts that are related to moral ideas or philosophies or quality can be reduced to a proverb. Doing so can make the concept easier to reference or remember or teach.
Rules work differently. They define or limit actions. They create liberty to do things in one situation and hinder liberties in another.
It is usually a mistake to take a proverb and make it into a rule. As Paul wrote, all things are lawful for one who has faith to walk in danger. Not everything is wise to do, though. Some things I am free to do are stupid.
Good proverbs can lead to wisdom. Even good rules can lead to bandage, though. Rules make me unconsciously feel free from needing the constant advice of the Holy Spirit.