The final argument in favour of the Sāṃkhya position reveals the whole issue very pointedly. The effect, they say, exists in the material cause because cause and effect are essentially the same but only different in form. Since the cause is existent, the effect also must exist. The Sāṃkhya has a special stake in this point because the whole debate is geared to proving the existence of prakṛti as the ultimate material cause of the universe. In the process they also attempt to establish, contra Vedānta, that the evolution of the universe is genuine and not merely illusory.