where is my fire?

I was stunned when a non-believer friend threw this question on my face.
Where is your fire?
It is dying out.
I mumbled while my eyes were trying to avoid his.
I felt so ashamed to tell him the answer, but anyhow I told him the truth.
I am tired.
Seriously I think I should ask myself and God about this as well.
I remembered the days when I was jumping praising Him during Sunday celebrations, the mornings I woke up earlier just to pray, the afternoon I spent in orpanange teaching the childeren, the evenings when few of us gathered for prayers, and the nights when I joined the worship practise...and also the piled up books which I should study for the day itself,
were left abondoned on my study desk.
Lord, is this my limit?
I am not satisfied. It must be more than this...
but where is my fire?
Lord, I thirst and I am tired. My soul is crying out for You.
Tell me Lord, where is my fire?
Ignite the fire in my heart again, O Lord. This is for You.
I pray.