Those things, again, are 'simultaneous' in point of nature
, the being of each of which involves that of the other, while at the same time neither is the cause of the other's being.
Owing to this struggle for life, any variation, however slight and from whatever cause proceeding, if it be in any degree profitable to an individual of any species, in its infinitely complex relations to other organic beings and to external nature, will tend to the preservation of that individual, and will generally be inherited by its offspring.
Yet unless it be thoroughly engrained in the mind, I am convinced that the whole economy of nature, with every fact on distribution, rarity, abundance, extinction, and variation, will be dimly seen or quite misunderstood.
Then there is nothing impossible or out of the order of nature in our finding a guardian who has a similar combination of qualities?
Would not he who is fitted to be a guardian, besides the spirited nature, need to have the qualities of a philosopher?
Nor do we need to seek any other reason for the number of these pellicles beyond this that the orifice of the venous artery being of an oval shape from the nature of its situation, can be adequately closed with two, whereas the others being round are more conveniently closed with three.
without examination, to deny what has been said, I wish it to be considered that the motion which I have now explained follows as necessarily from the very arrangement of the parts, which may be observed in the heart by the eye alone, and from the heat which may be felt with the fingers, and from the nature of the blood as learned from experience, as does the motion of a clock from the power, the situation, and shape of its counterweights and wheels.
The gift of speech also evidently proves that man is a more social animal than the bees, or any of the herding cattle: for nature
, as we say, does nothing in vain, and man is the only animal who enjoys it.
As the air I breathe is drawn from the great repositories of nature, as the light on my book is yielded by a star a hundred millions of miles distant, as the poise of my body depends on the equilibrium of centrifugal and centripetal forces, so the hours should be instructed by the ages and the ages explained by the hours.
It is the universal nature which gives worth to particular men and things.
And this hidden truth, that the fountains whence all this river of Time and its creatures floweth are intrinsically ideal and beautiful, draws us to the consideration of the nature
and functions of the Poet, or the man of Beauty; to the means and materials he uses, and to the general aspect of the art in the present time.
The very strict discipline was no doubt of much value in giving firmness and definite direction to his irregular nature
, and the range of his studies, both in literature and in other fields, was very wide.