Our Best for the Lord Jesus Christ

I wonder, have I done my best for Jesus,
Who died upon the cruel tree?
To think of His great sacrifice at Calv'ry!
I know my Lord expects the best from me.

How many are the lost that I have lifted?
How many are the chained I've helped to free?
I wonder, have I done my best for Jesus,
When He has done so much for me?