Why is it difficult for students to persevere in evangelism?

Michael Ots is an evangelist and apologist based in Bournemouth, England. He speaks at university mission weeks across Europe and trains training students in evangelism. He is the author of two books, the first of which, What kind of God?, has been translated into Romanian, Korean, Serbian, Spanish and Russian. He is also actively involved in the evangelistic ministry of his local church. Here he responds to questions from his talk, "10 Lessons in Student Evangelism from Across Europe," given at the 2019 European Leadership Forum.