What is the relationship between signs and miracles taught by Les?
The relationship is that all signs are miracles, but not all miracles are signs. A sign was a miracle God used for the Jew, who required a sign, and it carried an intrinsic lesson for Israel. John records eight signs: seven before the crucifixion and the eighth after the resurrection.
Les explains from John 4:48 that Jesus spoke of signs and wonders, noting the Greek word teros. He stresses that all miracles are not all signs; all signs are miracles, but not all miracles are signs. A sign was a miracle God used for the Jew, because the Jew required a sign. It was a manifestation of His power, but more than a miracle because it had an intrinsic lesson for the nation of Israel. Les says the Gospel of John contains eight signs, seven before the crucifixion—indicating completion, God's number—and the eighth after the resurrection.