Wait, isn't that just Doublethink from 1984? Holding two opposing thoughts is a sign that your mental model of the world is wrong and that it needs to be fixed. Where have you heard that maxim?
No you've got it completely backwards. Reality has multiple facets (different statements, all of which can be true) and a mental model that insists on a singular judgement is reductionist, missing the forest for the trees. Light is a wave and a particle. People are capable of good and bad. The modern world is both amazing and unsustainable. etc.
Holding multiple truths is a sign that you understand the problem. Insisting on a singular judgement is a sign that you're just parroting catchy phrases as a short cut to thinking; the real world is rarely so cut and dry.
