心灵可以被视为一个物理符号系统。

You control your future, your destiny. What you think about comes about. By recording your dreams and goals on paper, you set in motion the process of becoming the person you most want to be. Put your future in good hands — your own.

把无知视为对自由的限制，理由在于它使人做出若看清后果便不会做出的选择。