José Blanco White (1775-1841) not only is an active witness of a crucial period in the political life of the Hispanic world on both sides of the Atlantic, but he is also one of the most recognized thinkers and writers of his time. His legacy includes a valuable poetic work. These pages are interested in the theological spirit of one of his most critically admired English sonnets, Night and Death. However, in order to know that own faithful way in which the author expresses in his poem the human questioning for hope in the face of the experience of darkness and death, it is necessary to first penetrate, even if only in a synthetic way, in his understanding and experiencing of the relationship between religion and church, instinct of reason and truth of faith. This leads us to better meet with the background that encourages the poetic expression of his sensitivity towards the beauty of the world and the way in which man can discover in it the call of divine transcendence.