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If we say, 'I believe in Jesus,' but it doesn't affect the way we live, the answer is not that now we need to add hard work to our faith so much as that we haven't truly understood or believed in Jesus at all.

Timothy Keller (2009). “The Prodigal God: Recovering the heart of the Christian faith”, p.60, Hachette UK
If we say, 'I believe in Jesus,' but it doesn't affect the way we live, the answer is not that now we need to add hard work to our faith so much as that we haven't truly understood or believed in Jesus at all.