"Clearly" refers to the obviousness or self-evidence of the statement. In this context, "just" means "similarly" or "in the same way," or ig "exactly" if you like.
"Clearly" because exterior stimuli clearly influence both thinking and feeling, a concept supported by common experience and scientific understanding of human cognition and emotions.
"Clearly" because exterior stimuli clearly influence both thinking and feeling, a concept supported by common experience and scientific understanding of human cognition and emotions.