Ponos

From LSJ

ταῦτα δηλώσω αὐτός τε νοσήσας καὶ αὐτὸς ἰδὼν ἄλλους πάσχοντας → I shall describe those symptoms, since I myself had the disease and witnessed as well what others were suffering

Source

Wikipedia EN

Ponos /ˈpoʊˌnɒs/ or Ponus /ˈpoʊnəs/ (Ancient Greek: Πόνος Pónos) is the personification of Hardship and Toil. In the epic poem the Shield of Heracles, attributed to Hesiod, Phonos (singular) was one of the many figures, depicted on Heracles' shield.

According to Hesiod's Theogony, Ponos was the "painful" son of the goddess Eris ("Discord"), who was the daughter of Nyx ("Night"). His siblings include Forgetfulness (Lethe), Stories (Logoi), Lies (Pseudea), Broken Oaths (Horkos), Quarrels (Neikea), Dispute (Amphillogiai), Manslaughter (Androktasiai), Battle (Hysminai) and War (Makhai), Anarchy (Dysnomia), Starvation (Limos), Pain (Algea), and Ruin (Ate).

In some accounts, Ponos's was called the son of the primordial gods, Nyx (Night) and Erebus (Darkness) and brother to other daemones. "Their [Aether and Hemera's] brothers and sisters, whom the ancient genealogists name Amor/ Eros (Love), Dolus (Guile), Metus/ Deimos (Fear), Labor/ Ponus (Toil), Invidentia/ Nemesis (Envy), Fatum/ Moros (Fate), Senectus/ Geras (Old Age), Mors/ Thanatos (Death), Tenebrae/ Keres (Darkness), Miseria/ Oizys (Misery), Querella/ Momus (Complaint), Gratia/ Philotes (Favour), Fraus/ Apate (Fraud), Pertinacia (Obstinacy), the Parcae/ Moirai (Fates), the Hesperides, the Somnia/ Oneiroi (Dreams): all of these are fabled to be the children of Erebus (Darkness) and Nox/ Nyx (Night)."