ψαυστέον
From LSJ
Ποιητὴς, ὁπόταν ἐν τῷ τρίποδι τῆς Μούσης καθίζηται, τότε οὐκ ἔμφρων ἐστίν → Whenever a poet is seated on the Muses' tripod, he is not in his senses
English (LSJ)
A one must touch, Antyll. ap. Orib.10.23.23.
Greek (Liddell-Scott)
ψαυστέον: ῥημ. ἐπίθ., πρέπει τις νὰ ψαύσῃ, Ἄντυλλ. παρ’ Ὀρειβασ. 2. 436, Dar.