What is the tonic we must partake of, for physical strength and mental health?

 *What is the tonic we must partake of, for physical strength and mental health?*

*"Courage is the tonic for getting both physical as well as mental health and strength. Give up doubt, hesitation, and fear. Do not give any chance for these to strike root in your mind. People can achieve anything - they can even become Madhava (God), by means of the inner divine strength, with which they are equipped. To help you to give up fear and doubt, keep the Name of the Lord always on your tongue and in your mind. Dwell on the endless forms of the Lord and His limitless Glory, while you repeat the Name. Attach yourself to Him; then your attachment for these temporary objects will fall off; or at least, you will start seeing them in their proper proportion as having only relative reality. When the tiny little ego assumes enormous importance, it causes all this bother! That is the root of all the travails!"*

*~Divine Discourse, Sep 02, 1958.*