It is not about strength but about how one uses it, hmm? [He agrees with that mindset.]
A happier life, however...? If one's sorrows stem from one's inhuman status, then certainly, I believe that would be possible. [For a few moments he quietly continues his vegetables-cutting.]
...Humans suffer so deeply, so acutely, in ways I think many non-humans cannot understand or relate to. Human struggles are small - from a perspective of immense strength, or longevity, or even immortality. Non-humans too have their own struggles, I do not doubt, and their struggles are, most likely, greater. [He shrugs, lightly.] But since humans are so fragile, so weak, and of such short existence, their insignificant sorrows are immense to them.
Everyone is their own unique person, of course, whether human or not, but I wonder if there are not still fundamental differences in how we experience the world... an assumption though that might be. [His tone is mild and pensive - not accusing Yuuki of being insensitive or diminishing her own pain. These are just things Sebastian ponders a lot, apparently.]