The first says:

"The person who comes into your life is the right person"

In other words,no one comes into our lives by chance, all the people around us, who interact with us, are there for a reason, to make us learn and advance in each situation. 

The second law says: 

What happens is the only thing that could have happened"

Nothing, but nothing, absolutely nothing that happens to us in our lives could have been otherwise.
Not even the most insignificant detail. 
There is no: " If I had done such a thing, such another would have happened..".
Nope. 

The third says:

"Anytime it starts is the right time."

Everything starts at the right time, neither before nor after.
When we are ready for something new to start in our lives, that is when it will begin. 

And the fourth and last: 

"When something ends, it ends" 

Just like that. 
If something ended in our lives, it is for our evolution. 

Author: Unknown.
Rewrite from The soul journey with Sarah Moussa