Psalm 126:5-6 - Those who sow in tears will reap with songs of joy. He that goeth forth and weepeth, beaing precious seed, shall doubtless come again with rejoicing, bringing his sheaves with him.
Tears are precious in the sight of God when they are tears of longing, shed in intercession, or tears of joy as you praise God for answered prayer. The Son of God himself knows what it means to weep. The shortest verse in the Bible "Jesus wept" John 11:35 speaks volumes about the love and compassion of Jesus
We are not talking about tears of self-pity, for such tears is basically carnal. They may give relief from tension, for "a good cry" often helps the mood of a discouraged or depressed soul. We are here discussing the power of tears resulting from deep spiritual desire.
First, you should never be ashame of tears shed in agonizing prayer. For they testify to God of the depth of your concern and burning desires to see the need or the request granted.