6:30 What sign shewest thou. As they often did, the Jews required some miraculous sign before they would believe (e.g., John 2:18; 4:48). On one occasion, Jesus said He would give them no sign, except that of Jonah (Matthew 12:39). Nevertheless, He did perform many miracles—not to satisfy human doubt or curiosity, but to meet human needs—and John selected seven of these (see note on John 2:11) to encourage belief that He was, indeed, the Son of God (John 20:30-31).