L.P. Karsavin is a true pillar of Orthodox Russian philosophy of the twentieth century, a man of a complex, tragic fate - and an amazingly pure, beautifully traditional philosophical concept. Collection “Saligia. Noctes Petropolitanae" is a significant part of Karsavin’s creative heritage. It is here that his basic, classical idea of the divine All-Unity and the unity of man with God receives the most complete development - and reaches the highest degree of persuasiveness... "Saligia, or a very brief and soul-helpful reflection on God, the world, man, evil and the seven deadly sins" - the first philosophical the work of Lev Karsavin, immature in many ways, but focusing in itself the main themes of his thought. And the main themes of thought as such are “the first and last things”, as the name implies - God, world, man, evil. “Noctes Petropolitanae” (“Petropolitan Nights”) by Lev Karsavin are dialogues between the author and Love. Love as the basis of everything, as the very essence of God and earthly love as a reflection of the light of Eternal Love is the author’s main idea.