The astronomer discovers the cause of his uneasiness

‘At last the time came when the secret burst his reserve. We were sitting together last night in the turret of his house, watching the emersion of a satellite of Jupiter. A sudden tempest clouded the sky, and disappointed our observation. We sat a while silent in the dark, and then he addressed himself to me in these words: ‘Imlac, I have long considered thy friendship as the greatest blessing of my life. Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful. I have found in thee all the qualities requisite for trust, benevolence, experience, and fortitude. I have long discharged an office which I must soon quit at the call of nature, and shall rejoice in the hour of imbecility and pain to devolve it upon thee.’