I saw the duty and ...

I saw the duty and inestimable privilege _immediately_ to accept salvation by Christ. Humbly believing that through sovereign mercy and grace I have been enabled so to do, and having felt in some measure its effects on my still depraved and deceitful heart, it is my desire to show my attachment to the cause of Him who died for me by devoting my life to his service.
 David Livingstone

Quotes from the same author

The best remedy for a sick church is to put it on a missionary diet.
 David Livingstone
God had an only Son and He made Him a missionary.
 David Livingstone
Sympathy is no substitute for action.
 David Livingstone
This generation can only reach this generation.
 David Livingstone
If we have not enough in our religion . . . to share it with all the world, it is doomed here at home.
 David Livingstone