Dhammapada Verse 25.20

Sanskrit Verse

आत्मना चोदयेदात्मानं प्रतिवसेदात्मनां आत्मना । स आत्मगुप्तः स्मृतिमान् सुखं भिक्षो विहरिष्यसि ॥ २०॥

Bhikkhu Ānandajoti's translation

By oneself one must censure oneself and scrutinize oneself. The self-guarded and mindful monk will always live in happiness.