Musar do Izajasza 24:15

Correspondingly, he should contemplate the holiness of the Divine name at that time, as is mentioned in Ra’ya Meheimna (Parashas Kedoshim 126b): Fortunate are the limbs that are sanctified at the time of marital relations, for they are like the logs of a burnt offering, to which the holy fire attaches itself, and then the name of Hashem adheres to them. For this reason it is written: “With pyres shall you honor Hashem” (Yeshayahu 24:15). Similarly, it is written elsewhere in the Zohar (Parashas Metzora 56a): At the time of marital relations a man should reflect upon the will of his Creator in order that he bring holy children into the world. And in Parashas Kedoshim (84a): When Rabbi Shimon ben Yochai was walking through town with his disciples following after him and he spotted a woman, he would lower his eyes and say to his colleagues, “Do not turn to look, for whoever looks upon a woman in the daytime will have forbidden thoughts at night. And if a man has relations with his wife while engaging in forbidden thoughts it is said of the children thus conceived, ‘Do not make for yourself molten gods’ (Shemos 34:17). As rule from these come the apostates.

In commemoration of this miracle the Jews of every generation must observe the festival of Chanukah for eight days during which they must also kindle lamps. These lamps have the status of mitzvah lamps. In many places we find that such lamps are very precious in the eyes of the Holy One Blessed is He. Thus it states, “Honor Hashem with lights” (Yeshayahu 24:15). Any lamp that is lit for the sake of a mitzvah has wondrous and immeasurable sanctity. If we merited the spirit of prophecy we would recite the blessings over them and immediately attain understanding and insight into the future by means of the kindling of the lamps. For a mitzvah lamp causes an outpouring of prophecy completely analogous to that of a prophet prophesying by the command of Hashem.