How to relay a text label to another text label?

I am making a text to TV script for something I am making, I need help with the relay script.

So, I have tried using while true do and I can't think of any other thing I could use for this.

while true do 
game.workspace.tv.text.text = script.parent.text
end

textBox = script.Parent 
textLabel = workspace.Part.SurfaceGui.TextLabel

textBox.FocusLost:Connect(function()  
        textLabel.Text = textBox.Text
end)