Jesus gave the first hint of His death, which was the “baptism” that He was facing. There were many conflicts that would occur because of Him. He said that He came to send fire on the earth, which was a conflict between good and evil. There would be divisions between families and friends because of Him. We see those conflicts today because of differences of opinions of Jesus and other religions.
The Jewish leaders could use signs to predict changes in the weather, but could not recognize Jesus as the Christ by the signs that He had provided.