Speech is external thought, and thought internal speech. [ Rivarol ]

Prudery is the innocence of the vicious - external sanctity, assumed as a cover for internal laxity. [ Chatfield ]

In the eye of that Supreme Being to whom our whole internal frame is uncovered, dispositions hold the place of actions. [ Blair ]

The brain is the palest of all the internal organs, and the heart the reddest. Whatever comes from the brain carries the hue of the place it came from, and whatever comes from the heart carries the heat and color of its birthplace. [ Holmes ]

Experience: in that all our knowledge is founded; and from that it ultimately derives itself. Our observation employed either about external or sensible objects or about the internal operations of our minds, perceived and reflected on by ourselves, is that which supplies our understandings with all the materials of thinking. [ John Locke ]

As the index tells us the contents of stories and directs to the particular chapter, even so does the outward habit and superficial order of garments (in man or woman) give us a taste of the spirit, and demonstratively point (as it were a manual note from the margin) all the internal quality of the soul; and there cannot be a more evident, palpable, gross manifestation of poor, degenerate, dunghilly blood and breeding than a rude, unpolished, disordered, and slovenly outside. [ Massinger ]