The riotousness of the crowd is always very close to madness.

One of the most influential scholars and teachers in history was Alcuin, English but later of Charlemagne's court.
Wisdom in a letter from Alcuin to Charlemagne, dated 798.

Nec audiendi qui solent dicere, Vox populi, vox Dei, quum tumultuositas vulgi semper insaniae proxima sit.

Which is translated as:

And those people should not be listened to who keep saying the voice of the people is the voice of God, since the riotousness of the crowd is always very close to madness.

Vox populi, vox Dei - important to distinguish the two.