Seeing everything ‘outside’ as really connected to you:
He is a perfect mystic who, by comparison to his own self, sees the true equality of all beings, both in their happiness and distress. (B.G. ch 6)
Surrender humbly your self-interest; then you can be trusted to care for all things.
Love the world as your own self; then you can truly care for all things. (Tao, ch 13)
Being steady (in good times and in bad, seeing things more equally):
Reserve your judgments and words;
Smooth differences and forgive disagreements;
Dull your wit and simplify your purpose;
Accept the world.
Then, friendship and enmity,
Profit and loss,
Honor and disgrace,
Will not affect you;
The world will accept you. (Tao, ch 56)
Another translation:
Keep your mouth closed.
Guard your senses.
Temper your sharpness.
Simplify your problems.
Mask your brightness.
Be at one with the dust of the Earth.
This is primal union.
He who has achieved this state
Is unconcerned with friends and enemies,
With good and harm, with honor and disgrace.
This therefore is the highest state of man.
A person is said to be established in self-realization and is called a mystic when he is fully satisfied by virtue of acquired knowledge and realization. Such a person is situated in transcendence and is self-controlled. He sees everything—whether it be pebbles, stones or gold—as the same…. he regards all—the honest well-wisher, friends and enemies, the envious, the pious, the sinner and those who are indifferent and impartial—with an equal mind. (B.G. ch 6)
One who is not envious but who is a kind friend to all living entities…, who is equal to friends and enemies, who is equipoised in honor and dishonor, heat and cold, happiness and distress, fame and infamy, … always silent and satisfied with anything, who doesn't care for any residence, who is fixed in knowledge and engaged in devotional service, is very dear to me. (B.G. ch 12)