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"The former conviction that these two kingdoms were wholly different in structure, in function, and in kind of life, was not seriously disturbed by the difficulties which the naturalist encountered when he undertook to define them."
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"The condition you're in at this moment is the product of your previous thoughts, to change your condition, change your thoughts."
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"When life gives you pain, give life your unconditional love."

"You, your thoughts, and your imagination control the doorway to happiness. Service to the humanity is key to that doorway."
Explore more quotes by Asa Gray

"We may take it to be the accepted idea that the Mosaic books were not handed down to us for our instruction in scientific knowledge, and that it is our duty to ground our scientific beliefs upon observation and inference, unmixed with considerations of a different order."

"It was implicitly supposed that every living thing was distinctively plant or animal; that there were real and profound differences between the two, if only they could be seized."

"Your candor is worth everything to your cause. It is refreshing to find a person with a new theory who frankly confesses that he finds difficulties, insurmountable, at least for the present."

"We have spoken of beings so low in the scale that the individuals throughout their whole existence are not sufficiently specialized to be distinctively plant or animal: yet these are definite life in simpler shape."

"There is a class, moreover, by whom all these scientific theories, and more are held as ascertained facts, and as the basis of philosophical inferences which strike at the root of theistic beliefs."

"I accept extinction as best explaining disjoined species. I see that the same cause must have reduced many species of great range to small, and that it may have reduced large genera to so small, and of families."

"Is it philosophical, is it quite allowable, to assume without evidence from fossil plants that the family or any of the genera was once larger and wide spread? and occupied a continuous area?"

"I am sufficiently convinced already that the members of a profession know their own calling better than anyone else can know it."

"Why is it not just as likely that there were as many small general nearly at first as now, and as great a disproportion in the number of their species?"

"It remains to consider what attitude thoughtful men and Christian believers should take respecting them, and how they stand related to beliefs of another order."
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