And (Adam) was at his leisure in the garden of Eden, like one of the ministering angels. The Holy One, blessed be He, said: I am alone in My world and this one (Adam) also is alone in his world. There is no propagation before Me and this one (Adam) has no propagation in his life; hereafter all the creatures will say: Since there was no propagation in his life, it is he who has created us. It is not good for man to be alone, as it is said, "And the Lord God said, It is not good for man to be alone; I will make him an help meet for him …" (Gen. 2:18).
Adam Alone in Eden Like One of the Ministering Angels
Pirkei DeRabbi Eliezer 12:4