["He who can say how he burns with love, has little fire"
—Petrarca, Sonetto 137.]

say the Innamoratos, when they would represent an 'insupportable passion.

"Misero quod omneis
Eripit sensus mihi: nam simul te,
Lesbia, aspexi, nihil est super mi,
Quod loquar amens.
Lingua sed torpet: tenuis sub artus
Flamma dimanat; sonitu suopte
Tintinant aures; gemina teguntur
Lumina nocte."

["Love deprives me of all my faculties: Lesbia, when once in thy presence, I have not left the power to tell my distracting passion: my tongue becomes torpid; a subtle flame creeps through my veins; my ears tingle in deafness; my eyes are veiled with darkness." Catullus, Epig. li. 5]

Neither is it in the height and greatest fury of the fit that we are in a condition to pour out our complaints or our amorous persuasions, the soul being at that time over-burdened, and labouring with profound thoughts; and the body dejected and languishing with desire; and thence it is that sometimes proceed those accidental impotencies that so unseasonably surprise the lover, and that frigidity which by the force of an immoderate ardour seizes him even in the very lap of fruition. —[The edition of 1588 has here, "An accident not unknown to myself.">[— For all passions that suffer themselves to be relished and digested are but moderate:

"Curae leves loquuntur, ingentes stupent."

["Light griefs can speak: deep sorrows are dumb."
—Seneca, Hippolytus, act ii. scene 3.]

A surprise of unexpected joy does likewise often produce the same effect:

"Ut me conspexit venientem, et Troja circum
Arma amens vidit, magnis exterrita monstris,
Diriguit visu in medio, calor ossa reliquit,
Labitur, et longo vix tandem tempore fatur."

["When she beheld me advancing, and saw, with stupefaction, the Trojan arms around me, terrified with so great a prodigy, she fainted away at the very sight: vital warmth forsook her limbs: she sinks down, and, after a long interval, with difficulty speaks."— AEneid, iii. 306.]