Bhagavad Gita 3.21 · Krishna
Others are watching
यद्यदाचरति श्रेष्ठस्तत्तदेवेतरो जनः।
स यत्प्रमाणं कुरुते लोकस्तदनुवर्तते॥
yadyadācarati śreṣṭhastattadevetaro janaḥsa yatpramāṇaṃ kurute lokastadanuvartate
Whatever the best do, others follow. Whatever standard they set, the world goes along with it.
What it means
Krishna points to a simple truth. People copy those they admire. Whatever a respected person does, others do too. Whatever standard they set, the world follows. Arjuna is a hero. If he walks away from his duty, many will learn that walking away is acceptable.
The story
Arjuna is watched by two armies, by young warriors, by his own son. His choice won't stay private. Krishna wants him to see that his example carries weight, for good or ill.
In your life
Picture a mum who reads every evening, and years later her kids are readers too. Nobody told them to. They watched. Choose one habit you'd be glad for someone to copy. Do it where it can be seen.
Your example teaches more than your words.