Devakī became the residence of the Absolute Truth, but because she was confined within the house of Kaṁsa, she looked just like a suppressed fire, or like misused education. When fire is kept in a jug, the illuminating rays of the fire cannot be very much appreciated. Similarly, misused knowledge, which does not benefit the people in general, is not very much appreciated. So Devakī was kept within the prison walls of Kaṁsa's palace, and no one could see her transcendental beauty, which resulted from her conceiving the Supreme Personality of Godhead.
Kaṁsa, however, saw the transcendental beauty of his sister Devakī, and he at once concluded that the Supreme Personality of Godhead had taken shelter in her womb. She had never before looked so wonderfully beautiful. He could distinctly understand that there was something wonderful within the womb of Devakī. In this way, Kaṁsa became perturbed because he was sure that the Supreme Personality of Godhead, who would kill him in the future, had now come. Kaṁsa began to think, "What is to be done with Devakī? Surely she has Viṣṇu or Kṛṣṇa within her womb, so it is certain that Kṛṣṇa has come to execute the mission of the demigods. And even if I immediately kill Devakī, His mission cannot be frustrated." Kaṁsa knew very well that no one can frustrate the purpose of Viṣṇu. Any intelligent man can understand that the laws of God cannot be violated. His purpose will be served in spite of all impediments offered by the demons. Kaṁsa thought, "If I kill Devakī at the present moment, Viṣṇu will enforce His supreme will more vehemently. To kill Devakī just now would be a most abominable act. No one desires to kill his reputation, even in an awkward situation; if I kill Devakī now, my reputation will be spoiled. Devakī is a woman, and she is under my shelter; she is pregnant, and if I kill her, immediately my reputation, the results of my pious activities and my duration of life will all be finished."
He further deliberated, "A person who is too cruel is as good as dead, even in this lifetime. No one likes a cruel person during his lifetime, and after his death, people curse him. On account of his self-identification with the body, he must be degraded and pushed into the darkest region of hell." Kaṁsa thus meditated on all the pros and cons of killing Devakī at that time.
Kaṁsa finally decided not to kill Devakī right away but to wait for the inevitable future.