I believe everything in life comes in opposites.
There are times when you are hungry and times when you are not.
There are times when you are thirsty and times when you are not.
There are times when you are resting and times when you are not.
There are times when you are working and sweating, and times when you are not.
There are times when you are cold and times when you are not.
If you try to never be hungry, by eating all the time, you will feel worse.
If you try to never be thirsty by drinking water all the time, you will feel worse.
Cycles are about the switch of good and evil, the switch between two opposites, the switch between something and lack of something.
The more cycles you have in life, the more interesting your life will be.
For example, being thirsty for a whole day and then drinking water at the end of the day feels great.
Being hungry for a day and then eating a little feels great.
The cycles teaches that everything must have beginning and end.
If you try to do same thing all the time without opposite to counter it, you will fail.