The Infallible Word

Will the Word of God ever lead anyone into error? Why is the Word of God said to be ‘quick’ or alive? Is this referring to the written or the preached Word or both? How is the veil over the heart removed? Who are they that love God? What is the power spoken of here of the Word of God? Is there a spark of goodness in all of us? Did Lazarus have to cooperate with Christ in order to come forth from the dead?