Erasmus Darwin said this quote

Birth after birth the line unchanging runs,And fathers live transmitted in their sons;Each passing year beholds the unvarying kinds,The same their manners, and the same their minds:Till, as erelong successive buds decay,And insect-shoals successive pass away,Increasing wants the pregnant parent vexWith the fond wish to form a softer sex. ..

~ Erasmus Darwin

Till o'er the wreck, emerging from the storm, Immortal Nature lifts her changeful form: Mounts from her funeral pyre on wings of flame, And soars and shines, another and the same.

~ Erasmus Darwin

This compassion, or sympathy with the pains of others, ought also to extend to the brute creation, as far as our necessities will admit; for we cannot exist long without the destruction of other animal or vegetable beings either in their mature or embryon state. Such is the condition of mortality, that the first law of nature is 'eat, or be eaten.' Hence for the preservation of our existence we may be supposed to have a natural right to kill those brute creatures, which we want to eat, or which want to eat us; but to destroy even insects wantonly shows an unreflecting mind, or a depraved heart.

~ Erasmus Darwin

Such is the condition of organic nature! whose first law might be expressed in the words 'Eat or be eaten!' and which would seem to be one great slaughter-house, one universal scene of rapacity and injustice!

~ Erasmus Darwin