“happiness always sneaks in through a door you din't know you left open”
“Happiness often sneaks in through a door you didn't know you left open.”
“Happiness often sneaks in a door you did not know you had left open.”
“You should open these doors with care and caution-but, first, you must know how to close them. And above all, you must know which doors should be left unopened...”
“You can leave a door open for your 'friends,' but the truth is anybody can come in through that open door. And how do you know these friends are who they say they are, anyway?”
“Glory never arrives through the front door. She sneaks in uninvited round the back or through an upstairs window while you are sleeping.”