Another word for Omnipotent is ‘almighty’ which means he is ‘all powerful’. This quote indicates that God must be omnipotent to create the world out of nothing. The nothingness God creates from is not the nothingness of space, but an absolute nothingness which does not exist, since it is nothing. God has infinite power. All possible things that can be created, God can choose to create. He can't create aburdities (things that don't make sense, eg a square circle). God can't sin.
Creation out of Nothing
Makes it very clear that the Catholic Church has always taught that God created the universe out of nothing.
Omnipotent means 'all powerful'. We express our belief in God being all powerful through the creed, "We believe in God the Father, Almighty." Science teaches that energy (and matter) cannot be created. This is expressed through the law of the conservation of energy. Since God created the universe out of nothing, he must be all powerful. To create a particular object out of nothing would be to bring into existence a certain amount of matter which could be scientifically worked out to be a certain amount amount of energy (using E=mc2). But there is an infinite difference between nothing and something. It's not like an existing empty space surrounded by the rest of the universe, but an absolute nothing of not anything, not even an existing 'nothing'. Therefore, God must be infinitely powerful to be able to create something from nothing. If God can create something from nothing, then God can create whatever he likes.
God is also logical. There are some things which are impossible to God. God cannot sin (more about this later). God cannot create aburdities. An absurdity is something illogical, eg a square circle. God's infinite power has the ability to create all possible things, the number of which cannot be counted and so is also infinite in possibility.