Sensitive

Definitions: (1) responsive to the views of others; (2) tender or compassionate toward the feelings of others; (3) endowed with sensation; perceptive through the senses

Too Far: critical, temperamental, thin-skinned

Idiom: It takes one to know one
     Note: This is often used in a derogatory way, but when one is sensitive to the habits and quirks of a friend (and oneself), it can begin a shared conversation.

Quotes:
• It is usually the imagination that is wounded first, rather than the heart; it being much more sensitive. — Henry David Thoreau (1817-1862) American author
• Some like to think that a keen appreciation of art can actually make us better people – more just, more moral, more sensitive, more understanding. Perhaps that is true. — Paul Benjamin Auster (1947-) American writer & film director
     Note: If the art one is appreciating was created by Ma Nature, it certainly is true.