If Jesus gave a command that is impossible to fulfill such as Matt 5:48 then he was the biggest fraud ever to walk this planet.
If Jesus said to be one in the Father with He in you and you in Him as one as he was one in Him, John 17, and that is impossible for you, then doesn't that make Jesus a fraud?
If Jesus said the same signs will follow you if you believe and is impossible for you, then doesn't that make him a liar?
If you cant walk as he walks in his same light doesnt that make him of none effect?
And that list can go on and on. ANd isnt the real truth is that you do not believe him in these things he said you would be IF?
Have you ever had any children? It sounds like you haven't.
If you have children, you would know that one of the greatest ways to get your kids to listen to you when they're not really listening, is to let them fail in what they're doing. THEN, they will listen.
Jesus didn't lie. He simply spoke in a way that would reveal man's own weakness to themselves.
You've failed to be perfect haven't you? We know you have. Everyone has. So when Jesus said to "be perfect as your Father in heaven is perfect". It a self revealing statement. The Father in heaven has NEVER.... NOT been perfect.
YOU however, have always NOT BEEN PERFECT.
Such a statement reveals to YOU...what you are.... and reveals to YOU what GOD...... IS.
Do you seriously believe you can be PERFECT like God? Satan believed that too. He proved he wasn't... Just like YOU prove you're not every day of your life.