A closely related saying goes something like "It is the mark of an educated mind to be able to entertain two incompatible ideas at once" or something to that effect.
I think Jordan Peterson has used this analogy only referencing lobsters, and his followers wear shirts with lobsters on them to show their support
Where the desire of any soul is, and such as is its condition, there each of us nearly resides, and such for the most part each of us subsists. Plato, The Laws, 904c |