INEXPRESSIBLE (adj): not capable of being expressed; incommunicable; indefinable; indescribable
It's hard to talk about something inexpressible because it's...well...inexpressible. It's something so incredible that words just can't describe it. The bible uses this term only twice, emphasizing the importance of it.
II Corinthians 9:15 says, "Thanks be to God for his inexpressible gift!"
Of the 250,000+ English words, none of them can aptly describe the wonderfulness of God's gift. The gift of the earth, the gift of his son, the gift of heaven, and each tiny gift he gives us every minute is so grand that ten thousand tongues for ten thousand years could never give it the praise it deserves. Even if someone gives you a decked out mansion with a complimentary BMW in the driveway with live-in maids and cooks, it will get old. You can't spend the rest of your life praising the glory of your house, car, or luxury. So, what makes God's gift so inexpressible?
I Peter 1:8 says, "Though you have not seen him, you love him. Though you do not now see him, you believe in him and rejoice with joy that is inexpressible and filled with glory..."
God's gift gives us eternal and indescribable joy. This joy is incomparable, it does not fade, it does not grow old. It is forever perfect!
So, what is his gift? Romans 6:23 says, "For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord."
The gift of God's grace and love is eternal. You don't let the socks your grandma gave you for Christmas go unwrapped. Why not open something a little more worthwhile?