In William Shakespeare's, Macbeth, the number three emerges most frequently, not necessarily in plain number form, but different renditions of it are present throughout the entire play. Shakespeare most likely inserted the threes to reveal more about Macbeth and himself to people who took the time to look. The threes can be interpreted through many processes, some of which deal with the numerology of the number three, spiritual terms dealing with the number three, or just the fact that they are repetitive. .
According to the numerology of the number three, the number three person should be cheerful, creative, artistic, religious, and love a challenge. Macbeth does not fit these descriptions very well, but William Shakespeare does. William Shakespeare was born a number three; he even shows the characteristics that a true number three should have. But, there are also other characteristics of the number three that Macbeth shares as well, such as number threes dislike restraints, they prefer being the authority to others, and they desire to raise to the top wherever they go. As said by the Indian numerological point of view on the number three, you are seen as Jupiter, the ruling planet. This goes along with the theory that a "positive three" can see himself as a King ruling over everyone. Even know we don't know the full name of Macbeth (which is how you determine what numerological number you are); it is assumed that he would also be a three, and if that were true, Shakespeare and Macbeth would share qualities of each other, which could have been what Shakespeare was aiming for, a distorted version of himself. In contrast, the number threes could have also been in the play for the sake of balancing the storyline out. In spiritual terms the number three is keen on harmony and the balance of life. Everything has balance in itself, and the threes were used to balance Macbeth.
In addition to the numerology and the spiritual point of view of the number three, it was apparent that events were frequently occurring three times as well.