All of the scripture quotations I've used here are from the NRSV. I don't pretend to be a Bible scholar, but here are my comments:
Mark 4:41: And they were filled with great awe and said to one another, "Who then is this, that even the wind and the sea obey him?" The context of this verse is that Jesus has calmed a storm. He and his disciples are in a fishing boat in the middle of the Galilee when a terrible storm blows in. The disciples fear that the boat will be capsized and they'll all drown. However, Jesus is curled up asleep in a corner. They finally manage to wake him, and he admonishes them for not having faith in their safety. Constantly he works miracles in front of their very eyes, but they fail to truly understand him.
Mark 10:45: "For the Son of Man came not to be served but to serve, and to give his life a ransom for many." Jesus again admonishes his disciples for not recognizing who he is and what he has been called to do. In the preceding verses, James and John have requested that Jesus promote them to being top disciples. He tells them that they don't know what they're asking for. Only if they are willing to face the trials he must face. He explains that his calling is serve other people and not to be served by them.
Matthew 3:15: But Jesus answered him, "Let it be so now; for it is proper for us in this way to fulfil all righteousness." Then he consented. Jesus' speech in this verse is said in the context of being baptized by John the Baptist. John is taken aback when Jesus asks to be baptized and says to him, "I need to be baptized by you, and do you come to me?" John preached that his mission was to prepare the way for the messiah, and now he realizes that that very messiah has come to him and is humbling himself to be baptized by John. Jesus statement in this verse assures John that it is part of the prophecy for this to happen, and so John consents.
Matthew 5:13: "You are the salt of the earth; but if salt has lost its taste, how can its saltiness be restored? It is no longer good for anything, but is thrown out and trampled under foot. " This verse is part of the Beatitudes, which Jesus delivered in the Sermon on the Mount. By saltiness, Jesus is referring to faith. A believer who has lost his faith is no better than salt that has lost its saltiness.
I hope this helps!
In what context do you want a comment? Do you want to discuss similarities? Differences? I need more details.
How each quotation is significant? What are they talking about?