It’s the nature of the mind to wander. You are not the mind. The mind expands and sinks. It is impermanent, transient, while you are Eternal. There is nothing but Being. Getting into the Self is the thing. Never mind the mind. If your source is sought, the mind will disappear, leaving the Self (Being) unchanged.
~ Sri Ramana Maharshi (from Lecture 79; 19 November 1935)