It was said that the Buddha was omniscient, that he knew everything.
Since this is clearly impossible in conventional terms, what does it mean?
It may be no more than that the Buddha fully realized that the world, as it appeared to him, only appeared in that form due to his conditioning and his particular resulting viewpoint at any moment. Since there are an infinite number of viewpoints and conditionings, reality may appear in an infinite number of forms. The total of all these forms is emptiness, openness, reality as it is. So by knowing that he knew nothing, the Buddha knew everything.
In practice this means becoming less opinionated, more tolerant, knowing that our knowledge does not reflect reality but our conditioning and resulting viewpoint. Then we cease to be troubled by different opinions.
The unconditioned mind is no more than the awareness that we are conditioned beings.”