#reciprocal

Every relationship between persons causes a picture of each to take form in the mind of the other, and this picture evidently is in reciprocal relationship with that personal relationship. ↗

— Georg Simmel

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#causes #each #every #evidently #form

The first internal relation that is essential to a secret society is the reciprocal confidence of its members. ↗

— Georg Simmel

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#essential #first #internal #members #reciprocal

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

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#adaptation #arises #both #branches #causal