Verse 15

अन्तर्व्योमामलो बाह्ये सम्यगाचारचञ्चुरः ।हर्षामर्षविकारेषु काष्ठलोष्टसमस्थितिः

In plain words

Stainless within, like the sky, yet adept outwardly in right conduct — amid the disturbances of joy and resentment, he remains in a state equal to wood or a clod of earth.