God's "no" is a "yes" to His will.
All reality is a "yes" from God; for us, finite creatures, this "yes" may appear as a "no" precisely when it goes against what we desire at the moment. This inversion has three meanings: it teaches (God cannot be manipulated), it reveals the abyss between the Creator and the creature (between the one who receives existence and the One who is Existence itself), and it preserves the true relationship (I-Thou).