It's not the Christmas card, you've sent for years
Not the joyful sound, when sleigh bells ringOr the merry songs, children sing
The little gift you send, on Christmas dayWill not bring back the friend, you turned away
So may I suggest, the secret of ChristmasIt's not the things you do, at Christmas time
But the Christmas things you do all year through
"The Secret of Christmas" was written by Sammy Cahn and Jimmy Van Heusen for Bing Crosby, and first performed by Crosby in the 1959 film "Say One for Me". Crosby recorded the song again in 1964, for the album 12 Songs of Christmas.
If you have 3+ minutes on this busy day, click that link above to view and hear Bing sing it himself and be overcome with nostalgia - but in a good way.