Bhagavad Gita 18.42 · Krishna
The teacher's nature
शमो दमस्तपः शौचं क्षान्तिरार्जवमेव च।
ज्ञानं विज्ञानमास्तिक्यं ब्रह्मकर्म स्वभावजम्॥
śamo damastapaḥ śaucaṃ kṣāntirārjavameva cajñānaṃ vijñānamāstikyaṃ brahmakarma svabhāvajam
Calm, self-control, discipline, purity, patience, honesty, knowledge, wisdom and faith are the natural work of the contemplative.
What it means
Krishna describes the qualities of the brahmin, the contemplative temperament. Inner calm. Self-mastery. Discipline. Purity. Patience. Honesty. Knowledge and lived wisdom. Faith. These describe a natural teacher, scholar or spiritual guide, someone drawn to understanding and calm. It's a nature, not a birthright.
The story
Arjuna's teacher Drona was born a brahmin but chose war. Arjuna knows qualities and birth don't always match. Krishna speaks of qualities.
In your life
Remember the calm, patient teacher who changed your life at school. That's this nature. If it's yours, honour it. If not, learn one of these qualities from someone who has it.
Calm and wisdom make a natural guide.