Numerology connects everything
Numerology is a beautiful way of finding meaning in randomness. Numerology corresponds with planetary magick, tarot, and lots of other practices. Using numbers is a great way to add power to your spells. You can use however many correspond with the energy you're evoking, and it works with candles, crystal grids, use repetition/chants, or whatever else your mind can cook up.

1 is connected to the universal life force that binds us all. One is considered a source, and because any number multiplied by one equals itself, it’s a grounding number. In Tarot, one is represented by The Magician, who takes control of his own environment, and gains personal power by manipulating that which is around him.
2 is related to polarity and duality. Think of balance: the yin and yang, light and dark, god and goddess. Two represents one of each thing, side by side. The second chakra connects to relationships. That doesn't mean just with other people, but also how we relate to our jobs, our stuff, our money, and so forth.
3 is often seen as the most magical number in many traditions. Connected to the triple goddess, the realms of land, sea and sky, or the physical, mental and spiritual needs of mankind. In some magical systems, three is a symbol of action and interaction, while in others it means just the opposite; in other words, it relates to passiveness and neutrality.
4 is a symbol of stability. It corresponds to the four elements of earth, air, fire, and water, as well as the cardinal directions, four corners, and the four seasons. Four is sometimes connected to creativity. In Chakra energy work, the heart is the fourth chakra, and so it relates to emotions and our compassion towards others.
5 is equivalent to the four elements plus the addition of spirit as a fifth element. It’s also symbolic of the five human senses, the points of the pentagram, and in Christianity, the wounds of Christ. Five is sometimes considered a bit chaotic, as found in some interpretations of the Tarot, in which the five indicates struggle and conflict.
6 is related to sun energy. In many magical traditions, six is considered a solar number, and one of power and strong masculine energy. Because of this, it’s often connected to security and responsibility.
7 is related to lunar energy. Many see seven as connected to the moon, femininity, and workings related to intuition and wisdom. Thought forms and consciousness are represented by the number seven.
8 is infinity, and cycles. In some traditions, related to the eight NeoWiccan sabbat dates. Remember, not all traditions observe all eight sabbats. Eight is also connected to the planet Saturn, which relates to discipline and balance between the Earthly and the Divine. An eight flipped on its side is an infinity symbol.
9 is three times three, which makes it a triply powerful number in some systems. In many traditions, nine is associated with goddess energy. In some symbolism structures, nine indicates change and growth. In the Tarot, nines symbolize completion of a process.
0 means emptiness, and so it often symbolizes potential. Zero sees where we form something new out of what does not exist. In some cases, zero is seen as representative of the beginning, much like The Fool appears at the beginning of the Tarot, about to begin his new journey.