Thematic Bible: The four living creatures

and before the throne there was as it were a sea of glass, like crystal. And in the center, around the throne, are four living creatures, full of eyes in front and behind. The first living creature was like a lion, the second creature like an ox, the third creature had a face like that of a man, and the fourth creature was like a flying eagle. And the four living creatures, each of them with six wings, are full of eyes all around and within, and day and night they never cease to sing, "Holy, holy, holy, is the Lord God Almighty, who was and is and is to come."