It's the oldest text on mindfulness meditation in the buddhist tradition. In all likelihood, they didn't just read it and follow the instructions, as interpreti

It's the oldest text on mindfulness meditation in the buddhist tradition. In all likelihood, they didn't just read it and follow the instructions, as interpreting it's meaning from scratch is the life's work of a buddhist scholar. It doesn't include any of the buddhist moral teaching ("have goodwill towards others") so most likely OP meant that meditation had a positive effect on their life.