I like reading Ophra's "What I know for sure" at the end of her magazine.  It helps me remember to keep things in prospective. 

What I know for sure about real estate is that nothing is for sure.  I can't count on re-listing the house just because I sold it.  I can't count on the seller re-listing with me when the house does not sell and the listing agreement expires.  I can't count on the buyer finding another Realtor to show them a property or write an offer.  I can't count on being a REALTOR for life or any referrals. 

What I know for sure is that I must get off my real estate and make sure that I get that listing, or make sure the seller knows that I want to sell their house and I will work hard to do so.  I need to make sure the buyer knows that I am willing to show them properties until we find what they are looking for and I will write the offer for them and negotiate until we have a ratified contract.  I have to ask for referrals and I have to continue to keep in touch with previous sellers and previous buyers so that I remain top of mind.

These are simple things but what I know for sure.