In Genesis there are few places where God sees that what is done is good, like: God saw that the light was good, and he separated the light from the darkness. God called the dry ground "land," and the gathered waters he called "seas." And God saw that it was good. The land produced vegetation: plants bearing seed according to their kinds and trees bearing fruit with seed in it according to their kinds. And God saw that it was good God set them in the expanse of the sky to give light on the earth, to govern the day and the night, and to separate light from darkness. And God saw that it was good. \n So God created the great creatures of the sea and every living and moving thing with which the water teems, according to their kinds, and every winged bird according to its kind. And God saw that it was good. \n\n and so on. But 'good' is comparative, whenever there is something 'good' there should to be 'bad'. Does the Genesis then hints at that the Earth is not the first God's creature? There probably were not so successful attempts which were 'bad' compared to the 'good' last (hopefully) one? in Quran they say that Allah is a lord of the worlds so it could be that the God was experimenting with the worlds until they were good enough thank you for the answer but I was actually looking for a more christian explanations