Thank you Peter for your review and your ideas about my two sententiae. You are right, the title should be "sententiae". It was an oversight on my part. I will try to correct it as soon as possible.
Regarding "selling [myself] short by composing only these short sententiae", let me correct you. I do not only compose sententiae but also longer pieces like soliloquies. In them there is a longer development of the piece and elaboration of the theme(s).
Regarding "giving yourself an excuse not to develop your ideas", I look at sententiae more positively as valuable ideas in themselves. So the non-development of the idea is, in my opinion, a characteristic of the sententia and its theme. Perhaps unconsciously it might also be an excuse (or a characteristic of its composer, to continue the idea in the previous sentence). But I always have the option to compose longer pieces where I develop my ideas further.
I had not mentioned in my opening post that the first sententia is based on a melody I heard a bird singing in my dream!