To reinforce His point, Jesus gave two illustrations to the crowd following Him, that they would need to count the cost before committing to His ministry. Christ did not want people to follow Him who were not totally committed. One of the primary tests of discipleship is the ability to stand with Christ under persecution. Christ knew that His ministry would suffer severe trials and tribulations and those who would be His disciples would suffer the same. He did not want followers who would abandon Him, when the going got tough.
Many believers are comfortable with just being saved.