। ॥ १३७ ॥
In plain words
Suffering arrives — the kind that rises in your own body and mind, and every other kind as well — pushed in by the momentum of karma already set in motion. To bear it without turning it over and over in your mind: that is what is called titikṣā.
Close to the Sanskrit
Whatever suffering, beginning with the ādhyātmika kind, has arrived through the momentum of prārabdha — the bearing of it without brooding is declared to be titikṣā.