"Sodhmantra is external medicine and Bhavana is internal medicine." What is the concise meaning?

I would like to ask you about what the old ancient Thai people used to say regarding Sodhmantra (general Pali term for the chanting of the Lord Buddha’s Dhamma) and Bhavana (Pali term for actual meditation): “Sodhmantra is external medicine and Bhavana is internal medicine.” What is the concise meaning?

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If her son was still alive; she would be the rain when his mind was hot, she would be the fire to give warmth when he was cold, she would be the melody to comfort when he was lonely, and she would be the star-light when he looked up. However, she have lost my son which was diagnosed with Leukemia. Her life used to be smooth and now it’s like rock and roll. However, she still have to continue her steps. How? We will see...

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