We hear from God.. Through it's Word, that's why the bible is there to Guide Us "Christians" !
We live in a world where right and wrong mean something, that's we have our conscience to Judge us..
Basically the conscience we have as Christian is word of God inside us!
The bible talked about Faith is "Now faith is the substance of things hoped for, the evidence of things not seen." Hebrews 11:1
Faith in God helps us to hear from God..
Thanks @Sirknight