4. Be kind to yourself. Speaking badly even about yourself is unethical.
הלכות שמירת הלשון 
If someone bears you ill will, greet him with peace, for this will awaken a [positive feeling within him. http://www.ngplease.com
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It is the power of speech which defines man’s essence and distinguishes him from other creatures. http://www.ngplease.com
One of the prohibited forms of behavior is gossip. The Power of Thought and Speech לֹא תֵלֵךְ רָכִיל בְּעַמֶּיךָ וגו’:…
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Doing a mitzvah in this world causes a spiritual light to rest upon one’s soul: it is from this light…
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Wherever peace anywhere in the world is found, fear of God is found; wherever peach is lacking, fear of God…
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