O Jesus, fill me with your love now,
and I pray, accept me, and use me a little for your glory.
O do, do, I pray, accept me and my service, and take all the glory.

David Livingstone, 1813-1873 Scottish medical missionary, explorer in Africa and anti-slavery advocate
The Westminster Collection of Christian Prayers
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Hebrews 6:10-12 

For God is not unjust so as to overlook your work and the love that you have shown for his name in serving the saints, as you still do. And we desire each one of you to show the same earnestness to have the full assurance of hope until the end, so that you may not be sluggish, but imitators of those who through faith and patience inherit the promises.