Both of these branches of evolutionary science, are, in my opinion, in the closest causal connection; this arises from the reciprocal action of the laws of heredity and adaptation. Ernst Haeckel
From this time on, the universe is built up into an aggregate of permanent objects connected by causal relations that are independent of the subject and are placed in objective space and time. Jean Piaget
History creates comprehensibility primarily by arranging facts meaningfully and only in a very limited sense by establishing strict causal connections. Johan Huizinga
We should be exploring consciousness at the neural level and higher, where the arrow of causal analysis points up toward such principles as emergence and self-organization. Michael Shermer
