Definition (house style)
Patripassianism is an early Christian teaching holding that God the Father himself suffered on the cross — either through identification with the suffering Son, or through a modalist equation of Father and Son. The term derives from Latin pater (father) and passio (suffering). Classical trinitarian theology rejects patripassianism: it was the Son alone who suffered as a human being, though the Father delivered the Son to suffering (cf. Rom. 8:32). Patripassianism is often associated with modalism — the view that Father, Son, and Spirit are not three distinct Persons but three modes of one God.
On apokatastasis.wiki this is a contested term because George Warnock employs formulations that resemble patripassianism but are intended in a trinitarian-perichoretic sense. He does not claim the Father was crucified, but that the Father fully indwelling the Son co-suffered through the Son by virtue of their perichoretic union. Whether this remains within orthodox trinitarian bounds Warnock leaves unanswered.
Usage per author
Warnock
Warnock builds his christology around the complete indwelling of the Father in the suffering Son:
“God wants us to know that when His Son walked this earth, God the Father was in that Man, walking in His sandals. And when Jesus mingled amongst men as the sinless and spotless One, showing mercy and compassion to the multitudes, it was God the Father living in His Son and walking in His Son and showing mercy through His Son.”
[Warnock, The Hyssop that Springeth Out of the Wall, hyssop2.html]
On the suffering at the cross:
“When He hung on the Cross… it was not a case of God the Father being indifferent to the cries of His Son as He suffered this unspeakable anguish… but in the truest sense of the word, God the Father was Himself suffering the pain of every nail that went into His hand, and every thorn that pierced His brow.”
[Warnock, The Hyssop, hyssop2.html]
Warnock does not resolve the trinitarian tension, but his formulation differs from classical patripassianism: he does not claim the Father was crucified, but that the indwelling Father co-suffers through perichoretic union. The classical distinction of Persons is placed under pressure without being formally abolished.
Bullinger
Bullinger presupposes the classical distinction of Father and Son: Christ is seated at the right hand of the Father (Ps. 110:1; Heb. 10:12-13), a formulation implying clear personal distinction and providing no basis for a patripassianist reading.