One sentence
Metta is a state of universal goodwill or loving-kindness, and practices that cultivate it have been linked to benefits for mood, social connection, self-compassion, and stress.
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One paragraph
The shortest complete explanation: what metta is, how practice strengthens it, and how it can become a daily foundation.
One page
The core idea, the daily move, and the simplest script in a single printable page.
Short guide
A fuller beginning: what metta is, the 10-minute sit, and how to repeat it through the day.
Full book
The long version: the case, the practice, the science, the history, difficult situations, appendices, and references.