Confucianism is an ethical rather than a religious system, and hence was able to co-exist, though not on very friendly terms, with Buddhism, which reached China about the 1st century A.D.
Ancestral simplicity is more uniform, and does not co-exist with specialization and elaboration of a single organ.
For admitting that contraries co-exist for the perceiving subject, he was able to assert the co-existence of contrary qualities in the same object.
But this seems an unwarrantable concession to the vulgar opinion that two bodies cannot co-exist in the same place.
He was quite as clear as Luther in repudiating the medieval doctrine of transubstantiation, but he declined to accept Luther's teaching that Christ's words of institution required the belief that the real flesh and blood of Christ co-exist in and with the natural elements.