Paradox is sometimes requires holding two apparently contrary views. For example that form is empty and emptiness is form.
In right concentration we learn to focus on a single idea. As we develop the concentration capacity we come across ideas that seem to contradict each other. The dual notion comes to mind that even though not enlightened, we are already awake. How can this be?
One way of exploring this potential of opposing or contrary views having equal veracity is by exploring ideas different to our own. As we all know all our ideas are right. [ahem] Otherwise we would not have them right? ... mmm ...
Dukkha is certainty? There is only one true dharma?