A convincing argument may be built from the premises scattered through discourses unintended as justifications of beliefs.
Thus, some poetical allegations could be more useful than any commonsensical beliefs in a certain argument.
The difference between them is countable in terms of courage. The poet proves courage. The common knowledge inspires courage to that philosopher who is eager for acquiring a firm ground to his arguments.
Nonetheless, a convincing argument could be formulated because of the courage of the philosopher himself. In order to be accepted as a true argument as well, he should avoid only exposing his weakness which is common to all human beings, when they become visible matters of discussions.
Therefore, the courageous philosopher must disguise himself as a servant of objective truths.