“But I would not have you to be ignorant, brethren, concerning them which are asleep, that ye sorrow not, even as others which have no hope. For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will God bring with him.”
— 1 Thessalonians 4:13-14 (KJV)
Christians grieve, but not without hope. The promise of resurrection means death is not the end — there will be a reunion.