Here is a fourth proof: The order of perfection.
Ancient Coptic Monastery of St. Paul in Egypt
Traditionally in Coptic monasteries, the highest story is dedicated to the archangel Michael, but since he is already the titular saint of the large church in the center of the monastery, here the third floor has a chapel dedicated to the Holy Virgin, which is roofed with a wooden cupola. There are also cells for the monks on this level of the tower.
Monks live dedicated to the life of perfection.
We can see in the world degrees of perfection and goodness. We know these degrees because we can compare them with the maximum in any genus (genus = group of things). As humans have the capacity for both good and bad deeds they cannot be the source of all goodness. Therefore, the maximum in the genus of morality must be God (the most perfect being), who is the 'first cause', or source, of all goodness and perfection.
microscopic protezoans, many celled, sensitive animals, fish etc, higher animals, rational animal (Man), priests, monks, angels, saints, Virgin Mary, God.
The fourth way is taken from the gradation to be found in things. Among beings there are some more and some less good, true, noble, and the like. But more and less are predicated of different things according as they resemble in their different ways something which is the maximum, as a thing is said to be hotter according as it more nearly resembles that which is hottest; so that there is something which is truest, something best, something noblest, and, consequently, something which is most being, for those things that are greatest in truth are greatest in being... Now the maximum in any genus is the cause of all in that genus, as fire, which is the maximum of heat, is the cause of all hot things, as is said in the same book. Therefore, there must also be something which is to all beings the cause of their being, goodness, and every other perfection; and this we call God.
Here is the Fifth Proof:
Everything created is designed with a purpose in mind
Nature points to the notion of order in that things seem to have an innate sense of purpose (design?). We know that nothing that has purpose does so without the aid of a 'guiding hand' (E.g. an archer shooting an arrow at a target) thus everything in nature is directed to its goal by God. [Aquinas' formation of the Design Argument here is slightly different from the traditional view as presented, for example, by William Paley (see Paley's Watch). Aquinas agrees that there is order and purpose in the world but adds to this that inanimate objects (E.g. Planets), could not have ordered themselves, lacking the intelligence to do so, and so have been ordered by a Being with intelligence who could (which would be God).]
The fifth way is taken from the governance of the world. We see that things which lack knowledge, such as natural bodies, act for an end, and this is evident from their acting always, or nearly always, in the same way, so as to obtain the best result. Hence it is plain that they achieve their end, not fortuitously, but designedly. Now whatever lacks knowledge cannot move towards an end, unless it be directed by some being endowed with knowledge and intelligence; as the arrow is directed by the archer. Therefore, some intelligent being exists by whom all natural things are directed to their end; and this being we call God.