The Golden Rule:

Do unto others 

as we would have them do unto us,

is essential, and so is its corollary:

Do unto ourselves

as we would do unto others.

If we would not be rude, disrespectful, unkind, or irritable to others, then why should we be rude, disrespectful, unkind, or irritable to ourselves?

A positive restatement of both the Golden Rule and its corollary might be:

Be loving toward others as we would 
have others be loving toward us, 
while being just as loving 
toward ourselves as we are toward others.