If you really want to express gratitude to somebody, thank them twice. For example, if somebody does a favor for you, thank them right there on the spot.  Almost everybody gets this part right.

   To really demonstrate appreciation, though, deliver another “thank you” a few days later.  In writing; on the phone; in person.

   Say something like, “I just wanted to thank you again for your kindness last week.  You really went out of your way for me.  I know you are a busy person — and it really means a lot to me!”

   Everybody EXPECTS the first thank you.  Most people deliver it.  It’s the second thank you that really gets the job done. And — the same idea works when you owe somebody an apology.

   Of course you apologize when you’ve lost your temper.  But the second apology really communicates repentance.

   “Marge, I was thinking again about what happened last week.  I was so out of line.  Please, expect better conduct from me in the future.  I’m sorry!”