Speaking on Premier News Hour, Conder said that the campaign - called quotejesus.com - does not promote any sort of denomination and serves as a way to reach London's millions of residents and tourists.
He said: "What's so beautiful about this is that it is not a denominational thing, it's not something that is confrontational, it is a silent, gentle witness."
Conder added that because of concerns for political correctness in modern society, Christians have to be creative with how they share the Gospel.
"We can reach people who would never normally walk into the church - especially when we've lost the right to have scriptures read out in school assembly. We need to be different and think outside the box about how to reach people."
The campaign was first launched last summer.
The three sayings of Jesus selected for the adverts this year include: "You will be with me in paradise", "Blessed are the meek for they shall inherit the earth" and "Blessed are the peacemakers".
Listen to Nick Hull speak to Howard Condor here: