How do you know that God is good?

So for all the christians, how do you know that God is good? I mean it says so in the bible, but the bible is Gods words. Would you trust me if i wrote a book saying im good? Of course not. And how do we know that Satan is evil? It says so in the bible but the bible is writen by Satans enemy, God. So of course it would say that Satan is evil, God would want you on his side.
How do you know that God is good?
Updates:
19 h
I went to a christian school for 7 years, i have read the bible, my Main teacher whas a Priest, he whas also my mentor, we had a Priest who taught us christianity as special classes every Friday, he went from country to country teaching and spreading christianity.

I know what im talking about.
How do you know that God is good?
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