"that which flowers out in them" means "the thing that flowers out in them", I suppose referring to qualities exhibited by great men, such as wisdom, bravery, or whatever it may be..
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Sinbadsunnythe roots, at least, of that which flowers out in them~ at least the roots of the thing which flowers out in them
SinbadsunnyThe original says "of that which flowers out in them ", but I cannot understand the meaning of " of that which ".... the roots, at least, of that which flowers out in them.