In any negotiation, the power to penetrate the truth of the other side is essential in achieving success. Here the power of inner truth refers to situations in which one is able to perceive a fundamental wisdom, one which resides in even the most stubborn, recalcitrant hearts.
Inner truth is transformed into power when you disperse all prejudice and make yourself receptive (with discrimination). This power can be maintained as long as you do not waver in your own openness to truth.