“Strong” refers to to the level of passion with which you will defend the opinion. The point is that you are willing to passionately argue for your side—as opp

“Strong” refers to to the level of passion with which you will defend the opinion. The point is that you are willing to passionately argue for your side—as opposed to passively avoiding debate—but that you’re not simultaneously ignoring the arguments presented by the opposing side. The original article here is seemingly little more than a straw man argument against the quoted philosophy.