Tea cups are lovely, too. I don't have as many tea cups as I do mugs. They are perfect for things that mugs cannot do like for use at a tea party or for that day when you are in the mood for a small cup of hot drink. They are even good for desserts like puddings and trifles.
There is just something about a mug. When you put hot coffee or tea in it, it says comfort.
Mugs are there to help your friendships grow over a cup of coffee.
Mugs are companions when reading a book.
Mugs can warm your hands and your insides on a cold winter day.
They can tell stories of where you have been or remind you of the person who gave you a particular mug. I feel that mugs are friends.