Thou Art Thy Own Friend
The story
The lesson is about keeping an even mind. Just before this line it asks what discontent is and what pleasure is, and says to live bound by neither. Then it turns to the listener with a single word, "Man!", and says that help does not come from outside. It goes on to say that by restraining yourself you will get free from pain.
Ācārāṅga Sūtra, Book I, Lecture 3, Lesson 3, §4; tr. Hermann Jacobi, Sacred Books of the East 22 (1884), p. 33
The same moment, today
A person sits on the edge of a bed and stares at a silent phone. They had a hard day at work, and they want someone to text them back. They want a friend to say the right thing and take the bad mood away. But the phone doesn't buzz, and nobody calls. The room stays quiet. If they want peace tonight, they have to settle their own mind. Waiting for someone else to fix it won't work.

This line comes from a lesson about bearing heat and cold without complaining. It asks what pleasure is and what discontent is, and it tells you not to let either one rule you. In Jainism, there is no god who comes down to save you from your troubles. The Tirthankaras are teachers who show the path, but they aren't rescuers who carry you over it. Each soul has to do its own work to get free from pain. Jain monks live this out when they walk barefoot through the summer heat, and lay Jains live it when they fast quietly during Paryushan. Nobody else can calm your anger or carry your pain for you.
The lesson
Notice when you're waiting for somebody else to make you feel all right. Stop looking around the room, and take care of your own mind.
Where this comes from
Hermann Jacobi, 1884
The German scholar Hermann Jacobi translated the Acaranga Sutra in 1884 for Max Müller's Sacred Books of the East series. It's one of the oldest surviving Jain texts, but it belongs strictly to the Svetambara canon. Digambara Jains don't accept the book as scripture, because they believe the ancient texts were lost over time. Even so, Digambaras teach the exact same truth. Jainism has no creator god, and no outside power will rescue a soul. Jacobi translated the line directly: man is his own friend, so there's no point in looking for one beyond yourself.
A small reminder, on a laptop lid or a notebook cover, that the only person who can calm your mind is you.
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Related patterns

pairs with
The Awakened Sage Quote
From the very same lecture on bearing heat and cold.

contrasts with
Jain Mutual Service Quote
How souls hold each other up, even while walking alone.

extends to
Uttaradhyayana Sutra Jain Self Mastery Manuscript
Why mastering your own mind matters more than conquering others.