The paradox is now fully established that the utmost abstractions are the true weapons with which to control our thought of concrete fact.
Alfred North WhiteheadOne main factor in the upward trend of animal life has been the power of wandering.
Alfred North WhiteheadWithout deductive logic science would be entirely useless. It is merely a barren game to ascend from the particular to the general, unless afterwards we can reverse the process and descend from the general to the particular, ascending and descending like angels on Jacob's ladder.
Alfred North Whitehead