Four is the number of the great elements: earth, air, fire, and water.
There are four regions or directions: north, south, east, and west.
There are four seasons of the year: fall, winter, spring, and summer.
There are four phases of the moon: first, half, full, and last.
There are four divisions of the day: morning, noon, evening, and night.
The Bible also has ten references to the four winds.