Once when my father-in-law was leaving the house after lunch to return to the field to work, my mother-in-law said, 'Albert, you get right back in here and tell me you love me.' He grinned and jokingly said, 'Elsie, when we were married, I told you I loved you, and if that ever changes, I'll let you know.' It's hard to overuse the expression, 'I love you.' Use it daily.