There is a textual issue with Matthew 26:44.
In the critical text of the New Testament there is the phrase τὸν αὐτὸν λόγον εἰπὼν πάλιν
which states that "he said the same words again" The critical text adds the word πάλιν which means again.
The Byzantine text has the phrase,τὸν αὐτὸν λόγον εἰπών, which would be rendered as he said the same words.
Jesus repeated the same prayer He had given previously in verses 39 and 42. The NIV probably chose the phrase "the same thing" as a general reference since there are slight variations between verses 39 and 42. They did this even though the text has the Greek word λόγον which means words.
By the second part of the question you are generalizing or apply this passage to us. While there is much to concept that the key to life is our willingness to follow the will of God. That is embodied in the model prayer (also called the Lord's prayer) "thy will be done on earth as it is in heaven." To do that here you run the danger of missing two very important points: (1) the uniqueness of the situation where he literally sweat drops of blood as the Son of God prepared to go to the cross in a few short hours and He knew what that would mean as He would become our propitiation; (2) to generalize it you also have to take away the other part of His prayer, his desire that the cup would pass away if possible.
Just what Jesus meant by the cup passing from him is probably the most difficult part of the passage. There are a number of interpretations of the phrase that have been put forward, none of them in mind are completely satisfactory. That means they have both strengths and weakness.
I have taken this passage as his commitment to go to the cross because it is at the cross that salvation was made possible. That is why I love Hebrews 12:1-2
1 Wherefore seeing we also are compassed about with so great a cloud of witnesses, let us lay aside every weight, and the sin which doth so easily beset us, and let us run with patience the race that is set before us, 2 Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God.
By the way the cloud of witnesses were the Old Testament saints who willingly suffered and were persecuted for their faith in God. That is why Hebrews 11 is not a hall of fame. It is a list of people who suffered and the idea is if they can do it so can you. That is also the point of 12:1-3. If Jesus could suffer then we can too in our struggle against sin.
I also think Hebrews 12:1-3 also interprets the garden of Gethsemane. He desired to avoid the cross, which would have been against the Father's will and so he resisted the sin of disobedience till he sweat drops of blood. Hebrews refers to this as "resisted unto blood."