Macrobius attests:
The number seven is, one might almost say, the key to the universe. It was by this number first of all, indeed, that the World Soul was begotten, as Plato's Timaeus has shown. Seven refers to the number of planets and planetary spheres. The number seven motivates the moon, which is in the seventh planetary sphere, and regulates its course. Seven is the number by which man is conceived, developed in the womb, is born, lives and is sustained, and passing through all the stages of life attains old age; his whole life is regulated by it.

The number seven also marks the members of the body. There are seven within, which the Greeks call the dark members: the tongue, the heart, the lungs, the liver, the spleen, and two kidneys. There are seven others, each with its own veins or ducts, whose function is to receive and expel food and air: the pharynx, the esophagus, the stomach, the bladder, and the three intestines. Life without air is not sustained beyond the seventh hour and without food beyond the seventh day. There are seven visible parts of the body: the head, the trunk, two arms, two legs, and the generative organ.

Macrobius

The operations of the sense are performed through seven openings: the mouth, two eyes, two nostrils, and two ears. Jupiter, at his birth, laughed for seven days. There were seven Mercury astronauts (Walter Schirra, Donald Slayton, John Glenn, Scott Carpenter, Alan Shpehard, Virgil Grissom, Gordon Cooper), seven swans a swimming. We enjoy a seventh inning stretch, and coop up seven bedbugs, to put in meat with beans, and be swallowed down before the fire, to help such as have the quatriane ague.

The seven last words of Christ are actually seven last sentences: Father forgive them for they know not, Verily I say unto thee, Woman behold, My god why, I Thirst, It is finished, Father unto thy hands... (Luke 23:34, Luke 23:43, John 19:26-27, Matt 27:46, John 14:28, John 14:30, Luke 23:46).

Odysseus spent seven years on Ogygia. There are seven days in creation, seven days in the week, seven graces, seven divisions in the Lord's Prayer, seven ages in the life of man, seven phases of the moon, seven churches of Asia, seven candlesticks, seven stars, seven trumpets, seven horns, seven bodies in alchemy (sun is gold, moon silver, Mars iron, Mercury quicksilver, Saturn lead, Jupiter tin, and Venus copper), seven heroes of Christendom, seven deadly sins (pride, wrath, envy, lust, gluttony, avarice, and sloth), seven joys of the Virgin, seven sorrows of the Virgin, seven senses, seven sleepers, seven spirits, seven virtues, seven wonders of the world, Seven Years War, a seven-sided animal (a one-eyed man or woman, each having a right and a left side, a foreside and a backside, an outside, an inside, and a blind side). We look seven ways for Sunday, sail the seven seas, rally seven against Thebes, cheer the magnificent seven, fear the seventh son of a seventh son, arraign seven brides for seven brothers, and let lie seven sleepers of Ephesus.

A just man falleth seven times, and riseth up again.

Proverbs 24.16

Seven times a day will I praise thee.

Psalms 119.164

"Seven is Gods's number of perfection," Peter Popoff told the faithful, "I need a double portion so I am asking for $77 and God bless you."
But on the seventh day, the rest of God is set forth, and then, too, we first hear of its being hallowed. Much more might be said about the perfection of the number seven, but this book is already too long, and I fear lest I should seem to catch at an opportunity of airing my little smattering of science more childishly than profitably.

Augustine, City of God,11.31