History does include aspects of directionality, and the present range of causes and phenomena does not exhaust the realm of past possibilities.
Stephen Jay GouldThe extreme rarity of transitional forms in the fossil record persists as a trade secret of Paleontology. Evolutionary trees that adorn our textbooks have data only at the tips and nodes of their branches; the rest is inference, however reasonable, not the evidence of fossils.
Stephen Jay GouldAny decent writer writes because there's some deep internal need to keep learning.
Stephen Jay GouldTransitional forms are generally lacking at the species level, but they are abundant between larger groups.
Stephen Jay Gould