1) He knows how rambling, even gross, the invention of his work will be.
2) He envisions that it is quite possible that the new creation he works on will not his new creature might not want to keep away.
3) He fears that these two of the creations might procreate and the Earth will be filled with devils.
4) He sight of the smiling or rather grinning of the creation on him from outside the house causes his motivation to die and makes him demolish the new entity.
