But Hamlet's malady lay deeper than she supposed, or than could be so cured. His father's ghost, which he had seen, still haunted his imagination, and the sacred injunction to revenge his murder gave him no rest till it was accomplished. Every hour of delay seemed to him a sin, and a violation of his father's commands. Yet how to compass the death of the king, surrounded as he constantly was with his guards, was no easy matter. Or if it had been, the presence of the queen, Hamlet's mother, who was generally with the king, was a restraint upon his purpose, which he could not break through. Besides, the very circumstance that the usurper was his mother's husband filled him with some remorse, and still blunted the edge of his purpose. The mere act of putting a fellow-creature to death was in itself odious and terrible to a disposition naturally so gentle as Hamlet's was. His very melancholy, and the dejection of spirits he had so long been in, produced an irresoluteness and wavering of purpose which kept him from proceeding to extremities. Moreover, he could not help having some scruples upon his mind, whether the spirit which he had seen was indeed his father, or whether it might not be the devil, who he had heard has power to take any form he pleases, and who might have assumed his father's shape only to take advantage of his weakness and his melancholy, to drive him to the doing of so desperate an act as murder. And he determined that he would have more certain grounds to go upon than a vision, or apparition, which might be a delusion.