Grieving the Loss of Unsaved Loved Ones

How can I grieve "in hope," if the loved ones I have lost were not Christians? [1 Thessalonians 4:13-18, Ezekiel 33:11, Hebrews 9:27, 2 Peter 3:9, Titus 2:11, 1 Corinthians 4:5, Romans 2:6, John 3:16].