Bhagavad Gita 2.15 · Krishna
Steady in pain and pleasure
यं हि न व्यथयन्त्येते पुरुषं पुरुषर्षभ।
समदुःखसुखं धीरं सोऽमृतत्वाय कल्पते॥
yaṃ hi na vyathayantyete puruṣaṃ puruṣarṣabhasamaduḥkhasukhaṃ dhīraṃ so’amṛtatvāya kalpate
The steady one, unshaken by these, the same in pain and pleasure, is ready for the deathless.
What it means
Krishna describes the person he hopes Arjuna will become. Dhira, steady, wise. Not someone who feels nothing, but someone who isn't thrown off balance by highs or lows. Such a person, he says, is fit for amritatva, the deathless state, freedom from what binds us.
The story
Krishna calls Arjuna purusharshabha, bull among men, reminding him of his strength. Arjuna has been steady in a hundred battles. Now Krishna asks him to bring that same steadiness inward, to his grief.
In your life
Imagine a pilot whose voice stays calm through turbulence, whether the landing is smooth or rough. That calm is trained, not natural. Practise it in small things. Stay even when a parcel's late or a compliment comes.
Steadiness is a strength you can train.