How do you know a "thing" is from God? Luke 7-8

Men of God know when God speaks because they know God's Word and God fulfills and speaks in concert with His word.   That statement might seem odd but it is a truth we have to believe and remember.   God will not do anything contrary to His Word.  If you want to know if God is "in it" (whatever you are talking about) than look to see if the thing you are in is "in concert" with God's Word.   God won't lead us contrary to what he already said.   So, when John the Baptist wanted to know if "Jesus" of Mary and Joseph was the Christ (the Messiah), Jesus only had to quote a passage from Isaiah.   John the Baptist would know Isaiah.   He would know that only the Messiah could do what Jesus was doing.   So, John the Baptist didn't have to worry about whether he should go here or go there or believe this or that.   He knew that God will not speak or do contrary to His Word.   That is refreshing to know.  Many things we want to do are not mentioned in God's Word.   But, when are "led" by the Spirit to do them we need to make sure these "things" don't lead us into something that will conflict with a precept, principle, promise or example in the Word.   We will know if the "thing" is of God when we see that it doesn't conflict with God's Word but rather is in concert with it and fulfills it.