मैत्र्यादिषु बलानि ॥ ३.२३ ॥
3.23 maitryādisu balāni
maitri – friendliness; amity; good will
adishu – leading with; beginning with
balani – strength; force; invigoration
By meditating on compassion, loving kindness, equanimity, and joy, you invigorate these qualities.
Patanjali's yoga sutras 
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