Good things always happen to good people.*

And by good I mean everything: honest, respecting, caring ...
You can be good due to two reasons
1. Consciously choosing to be good.
2. Unconsciously choosing good: It's Just like your religion. You didn't choose it. You were just X (Hindu, Muslim, Christian, Jain, Sikh etc.) and you would remain an X throughout your life, no matter what.

If you are consciously choosing good, You should be aware of a myth:
Good things always happen to good people.

Why? Because you are good!
Is there some kind of entitlement for being good? If you think so. Think again.

The world is complex. The good and bad overlap. Sometimes good people pay despite no fault of theirs.

I do not imply that being good is disadvantageous, but sometimes It would be and knowing this helps you to be good consciously. That way You wouldn't blame such as
"This world is not for good people."
"Only the corrupt succeed in today's world."
etc.

Be good but remember like all approaches in life it will also have its pros and cons.

The pros of being good are You don't have to remember what you lied to whom, You don't need to fake and most importantly good qualities are a reward in themselves. So Be smart. Be good. :)