Answer:
I am a ship that can be made to ride the greatest waves. I am not built by objects but built by minds.
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I’ve told you all I cannot tell you more.
The more you take away from me the bigger I shall get.
I am the state when a person is holding a person inside
I make you weak at the worst of all times. I keep you safe I keep you fine. I make your hands sweat and your heart grow cold. I visit the weak but seldom the bold.
It rows quickly with four oars but never comes out from under his own roof. What is it?