 Now, one initial worry about safety as a condition on knowledge is that, given that belief and truth are also necessary for knowledge, safety will always be (in this context) a true-true conditional (that is to say, both its antecedent and consequent will be true). This means that Sosa cannot accept the possible worlds semantics for subjunctive conditionals briefly sketched above, at least if we assume that every world is closer to itself than any other word. For when we have a true-true conditional, the closest world where the antecedent is true will be the actual world, and so every such conditional will be true (and, hence, any condition formulated by such conditionals will be trivially  satisfied).[15]  Rather, Sosa understands the truth-conditions for the relevant conditions as requiring that the consequent be true in all nearby possible worlds where the antecedent is true.