Works of St. Anselm, tr. by Sidney Norton Deane, [1903], at sacred-texts.com
Every human soul is immortal. And it is either forever miserable, or at some time truly blessed.
BUT if the soul is mortal, of course the loving soul is not eternally blessed, nor the soul that scorns this Being eternally miserable. Whether, therefore, it loves or scorns that for the love of which it was created, it must be immortal. But if there are some rational souls which are to be judged as neither loving nor scorning, such as the souls of infants seem to be, what opinion shall be held regarding these? Are they mortal or immortal? But undoubtedly all human souls are of the same nature. Hence, since it is established that some are immortal, every human soul must be immortal. But since every living being is either never, or at some time, truly secure from all trouble; necessarily, also, every human soul is either ever miserable, or at some time truly blessed.