This chapter considers existing arguments against perfect being theism, classifying them into three types: (i) arguments that purport to show the internal incoherence of God’s individual properties, (ii) arguments that purport to show the mutual inconsistency between God’s properties, and (iii) arguments that purport to show the mutual inconsistency between the set of God’s properties and a certain fact about the actual world. The chapter then develops a radically new and economical defence of perfect being theism, a defence that appeals to the maximal concept of God. This defence, it is argued, undercuts nearly all the arguments of the three types at once.