Moral Letters to Lucilius Section 8

Quemadmodum flamma non potest obprimi, nam circa id effugit, quo urgetur; quemadmodum aer verbere atque ictu non laeditur, ne scinditur quidem, sed circa id, cui cessit, refunditur; sic animus, qui ex tenuissimo constat, deprehendi non potest nec intra corpus effligi, sed beneficio subtilitatis suae per ipsa, quibus premitur, erumpit. Quomodo fulmini, etiam cum latissime percussit ac fulsit, per exiguum foramen est reditus, sic animo, qui adhuc tenuior est igne, per omne corpus fuga est.

Comme on ne saurait comprimer la flamme, car elle s’échappe tout autour de ce qui pèse sur elle ; et comme l’air, qu’on le frappe de pointe ou de taille, n’est ni blessé ni divisé même, mais enveloppe l’objet auquel il a fait place ; ainsi l’âme, la substance la plus déliée de toutes, ne peut être retenue ni refoulée dans le corps ; sa subtilité se fait jour à travers les barrières mêmes qui la pressent. Tout comme la foudre, après qu’elle a rempli tout un édifice de ravages et de feux, se retire par la plus mince ouverture, l’âme, plus insaisissable encore que le feu, trouve à s’enfuir par le corps le plus dense.

Just as fire cannot be crushed out, since it will escape round the edges of the body which overwhelms it; just as the air cannot be damaged by lashes and blows, or even cut into, but flows back about the object to which it gives place; similarly the soul, which consists of the subtlest particles, cannot be arrested or destroyed inside the body, but, by virtue of its delicate substance, it will rather escape through the very object by which it is being crushed. Just as lightning, no matter how widely it strikes and flashes, makes its return through a narrow opening, so the soul, which is still subtler than fire, has a way of escape through any part of the body.