You may not see the reason at the exact time, but some day you will. And looking back I thank God every day for unanswered prayers!! If I was in control of my life I would be stuck somewhere with someone and miserable. When you're finally in the right place and with the right person everything finally makes sense and you realize you should have been more trusting all along ;)
Plead the honor and glory of God's name. Throughout the Bible, this is one of the main appeals that intercessory priestly people made before God. They reminded God of His name and glory and appealed for Him to act on behalf of His name.