IV.

And if I laugh at any mortal thing, 'T is that I may not weep; and if I weep, 'T is that our nature cannot always bring Itself to apathy, for we must steep[dh] Our hearts first in the depths of Lethe's spring,[di] Ere what we least wish to behold will sleep: Thetis baptized her mortal son in Styx; A mortal mother would on Lethe fix.