Saṁvega: The shock that wakes urgency
Saṁvega is the jolt of looking straight at suffering. Turning back to look, when walking on was available, is where it begins, and "behold" is the moment the sight lands with nothing standing between the seer and it. The jolt is worth having, since it drives a person toward ending harm, where numbness would let the oppressions go on unwatched.
Dukkha: Suffering
Dukkha is the pressure no arrangement of life removes. Tears on the faces of the oppressed are its plainest form, arriving from another person's hand rather than from age or sickness. Seeing all of it under the sun, the whole spread of oppressions and not one sad case, is the first task the teaching sets, and it comes before any question of remedy.
Vihiṁsā: Cruelty, the turn toward hurting
Vihiṁsā is the intention to cause pain. Power gathered on one side becomes oppression only when cruelty steers it, and cruelty is a habit of thought long before it reaches anybody's back. It feeds on aversion and gets easier every time it works, which is why the strong keep pressing and rarely stop on their own.
Attāṇo loko: The world has no shelter
Attāṇo loko names a world with no protector standing over it. No comforter, and again no comforter: nobody arrives, and no amount of power under the sun will send anyone. Facing this squarely is what turns a person into the shelter for somebody else, since none is coming down from above.
Karuṇā: Compassion
Karuṇā is the heart moving at another's pain. The comforter who never comes would be exactly this, someone who sits down beside the weeping, stays there, and does not need the crying to stop first. It can be trained, and it starts where the returning and the looking started, with letting the tears register instead of hurrying past them.