When people say "Good Luck!" to us, we as Christians ought to respond along these lines ~ "I'm so sorry but I take offence with your statement "Good Luck". Events in my life are God-incidences and I'd rather you said, "God's grace be with you!"
Well, what a challenging thought to act on! Personally, I try to avoid (as much as possible) using the phrase "good luck", usually replacing it with a verbal "All the best!" or written "Every blessing!"
Here's another thought to ponder.
GOD'S GRACE
It offers a 'Delete' button for the past
and a 'New Page' for the future.
It heals yesterday's hurts
and fuels tomorrow's hope.
Lyn Hunter