Jesus is concerned with the understanding of His disciples (followers). I quote from Mark 8-9 in parts and add boldness to some verses. Please read the whole chapters from your bible.
Brief notes: Seeing the kingdom of God requires understanding of God’s nature and God’s will for His kingdom. Jesus shows us how it is operated. We need to look at things through His eyes and His heart. Jesus is God focused at all times. The pharisees look at what Jesus does with a wrong motive. They do not want to believe in Him and they have no real interest in wanting to know God personally. Jesus wants us to do differently. We see lots of signs but the Person God is bigger than the signs. The spiritual God matters (and not physical stuff). Seek God.
“How is it you do not understand?” (Mark 8:21)
He wants us to “see the kingdom of God present with power”! (Mark 9:1)
4 Then His disciples answered Him, “How can one satisfy these people with bread here in the wilderness?”
5 He asked them, “How many loaves do you have?”
And they said, “Seven.”
7 They also had a few small fish; and having blessed them, He said to set them also before them. 8 So they ate and were filled, and they took up seven large baskets of leftover fragments. 9 Now those who had eaten were about four thousand. And He sent them away,
11 Then the Pharisees came out and began to dispute with Him, seeking from Him a sign from heaven, testing Him. 12 But He sighed deeply in His spirit, and said, “Why does this generation seek a sign? Assuredly, I say to you, no sign shall be given to this generation.”
13 And He left them, and getting into the boat again, departed to the other side. 14 Now the disciples had forgotten to take bread, and they did not have more than one loaf with them in the boat. 15 Then He charged them, saying, “Take heed, beware of the leaven of the Pharisees and the leaven of Herod.”
16 And they reasoned among themselves, saying, “It is because we have no bread.”
21 So He said to them, “How is it you do not understand?”
25 Then He put His hands on his eyes again and made him look up. And he was restored and saw everyone clearly. 26 Then He sent him away to his house, saying, “Neither go into the town, nor tell anyone in the town.”
29 He said to them, “But who do you say that I am?”
Peter answered and said to Him, “You are the Christ.”
30 Then He strictly warned them that they should tell no one about Him.
31 And He began to teach them that the Son of Man must suffer many things, and be rejected by the elders and chief priests and scribes, and be killed, and after three days rise again. 32 He spoke this word openly. Then Peter took Him aside and began to rebuke Him. 33 But when He had turned around and looked at His disciples, He rebuked Peter, saying, “Get behind Me, Satan! For you are not mindful of the things of God, but the things of men.”
34 When He had called the people to Himself, with His disciples also, He said to them, “Whoever desires to come after Me, let him deny himself, and take up his cross, and follow Me.
And He said to them, “Assuredly, I say to you that there are some standing here who will not taste death till they see the kingdom of God present with power.”
2 Now after six days Jesus took Peter, James, and John, and led them up on a high mountain apart by themselves; and He was transfigured before them. 3 His clothes became shining, exceedingly white, like snow, such as no launderer on earth can whiten them.7 And a cloud came and overshadowed them; and a voice came out of the cloud, saying, “This is My beloved Son. Hear Him!”
14 And when He came to the disciples, He saw a great multitude around them, and scribes disputing with them. 15 Immediately, when they saw Him, all the people were greatly amazed, and running to Him, greeted Him. 16 And He asked the scribes, “What are you discussing with them?”
17 Then one of the crowd answered and said, “Teacher, I brought You my son, who has a mute spirit. 18 And wherever it seizes him, it throws him down; he foams at the mouth, gnashes his teeth, and becomes rigid. So I spoke to Your disciples, that they should cast it out, but they could not.”
23 Jesus said to him, “If you can believe, all things are possible to him who believes.”
24 Immediately the father of the child cried out and said with tears, “Lord, I believe; help my unbelief!”
28 And when He had come into the house, His disciples asked Him privately, “Why could we not cast it out?”
29 So He said to them, “This kind can come out by nothing but prayer and fasting.”
30 Then they departed from there and passed through Galilee, and He did not want anyone to know it. 31 For He taught His disciples and said to them, “The Son of Man is being betrayed into the hands of men, and they will kill Him. And after He is killed, He will rise the third day.” 32 But they did not understand this saying, and were afraid to ask Him.
35 And He sat down, called the twelve, and said to them, “If anyone desires to be first, he shall be last of all and servant of all.” 36 Then He took a little child and set him in the midst of them. And when He had taken him in His arms, He said to them, 37 “Whoever receives one of these little children in My name receives Me; and whoever receives Me, receives not Me but Him who sent Me.”
41 For whoever gives you a cup of water to drink in My name, because you belong to Christ, assuredly, I say to you, he will by no means lose his reward.
42 “But whoever causes one of these little ones who believe in Me to stumble, it would be better for him if a millstone were hung around his neck, and he were thrown into the sea.
49 “For everyone will be seasoned with fire, and every sacrifice will be seasoned with salt. 50 Salt is good, but if the salt loses its flavor, how will you season it? Have salt in yourselves, and have peace with one another.”