It means you can choose to believe what they are saying or you can choose to doubt what they are saying.
It means I believe you. It could also mean I know who/how you are.
it means you are not as clever or smart as you believe you are
A man of his word is someone who can be trusted, a man who will honour his promises and do what he says he will do and believe what he says he believes.
If someone says that they believe there was a ghost in your former self, they may believe you were reincarnated as someone else. This is something that people believe, but may not be proven with evidence.
They can't believe what is happening and want to be sure they are not dreaming.
When someone says that something is ridiculous they mean that it is totally crazy. This is something that is hard to believe.
If someone says "That made a believer out of me," it just means that something convinced them to believe in whatever it was.
Then you trust them and their judgment.
Most likely, it means they are mentally ill and believe they are Jesus Christ.
If someone says that they validate you as a person, they mean that they consider you to be a worthwhile person.
what does it mean for someone to be attracted to you
what does it mean when someone says stalactites stem from the ceiling of a cave