No matter what kind of mood you may find yourself in, the bible has something to say about it, especially in the book of Psalms. For the record, if you're looking for something warm and fuzzy to stir up the emotion of your choosing, Leviticus just doesn't come highly recommended. To do lists, yes. Comfort, no.
God brought this verse to my mind tonight as I was praying:
They that sow in tears shall reap in joy. He that goeth forth and weepeth, bearing precious seed, shall doubtless come again with rejoicing, bringing his sheaves with him. (Psalm 126:1-5)
They that sow in tears shall reap in joy. Without a doubt. I think of passion and compassion with this verse. I think of prayer and I think of what it means to care so much about something or someone that in the act of submitting our requests to God we end up begging for His mercy, help and forgiveness. These are the prayers that bring us to the inner courts of God. These are the prayers that can move the mountains in our lives. These are the prayers that bring joy when the God's timing has come to pass.
Why then, don't we pray like this all of the time? Why don't we always pray as if our very lives and the lives of our loved ones depended upon it? I can't speak for everyone, but for me, it all boils down to time and energy. It is a sacrifice to sow with tears. It is a sacrifice of time because it takes awhile to put away all of the day's distractions to come into God's presence and it is a sacrifice of strength as well. It is emotionally draining to pray with that kind of passion. It is worth it, but it is draining.
So when does the joy come? Some time after the praying. God is the only one who knows that answer exactly. However He does tell us that joy will come.
For his anger endureth but a moment; in his favour is life: weeping may endure for the night, but joy cometh in the morning. (Psalm 30:5)
Joy comes in the morning (maybe not always the next morning) just as sure as the sun rises each and every day. We can be joyful in our knowledge of God's faithfulness to us...joyful in knowing that we are forever loved by the Creator of the universe and that He has everything under control. In this we can rejoice and have hope.
This I recall to my mind, therefore have I hope. It is of the Lord's mercies that we are not consumed, because his passions fail not. They are new every morning: great is thy faithfulness. The LORD is my portion, saith my soul; therefore I will hope in him. The Lord is good unto them that wait for him, to the soul that seeketh him. It is good that a man should both hope and quietly wait for the salvation of the LORD. (Lamentations 3:21-26)