Only while reading the study notes did I realize that my bible goes from Mark 11:25 to Mark 11:27, omitting verse 26. The study notes say: Some manuscripts add verse 26: But if you do not forgive, neither will your Father who is in heaven forgive your trespasses. The notes continue: This verse does not appear in the most important ancient manuscripts of Mark's gospel. Evidently scribes inserted it later because they associate the preceding verse with Matthew 6:14.
So I read Matthew 6:14 which says the same thing as verse 26 of Mark. They're basically identical, meaning there is nothing wrong with the words omitted. However, in an effort to be true to the manuscripts, it was taken out. This demonstrates the great care and painstaking efforts made to make ensure the translation I'm reading is accurate and reliable.
Bigger question: How can I be confident that the Bible, as a whole, is reliable? There's a good deal riding on whether the words of this book are true. A few highlights from an article by Hank Hanegraaff regarding bible reliability:
There are more than 14,000 manuscripts and fragments of the Old Testament of three main types: (a) approximately 10,000 from the Cairo Geniza (storeroom) find of 1897, dating back as far as about AD. 800; (b) about 190 from the Dead Sea Scrolls find of 1947-1955, the oldest dating back to 250-200 B.C.; and (c) at least 4,314 assorted other copies. The short time between the original Old Testament manuscripts (completed around 400 B.C.) and the first extensive copies (about 250 B.C.) — coupled with the more than 14,000 copies that have been discovered — ensures the trustworthiness of the Old Testament text.
The same is true of the New Testament text. The abundance of textual witnesses is amazing. We possess over 5,300 manuscripts or portions of the (Greek) New Testament — almost 800 copied before A.D. 1000. The time between the original composition and our earliest copies is an unbelievably short 60 years or so.
The eyewitness document test, sometimes referred to as the internal test, focuses on the eyewitness credentials of the authors. Luke, who wrote the Books of Luke and Acts, says that he gathered eyewitness testimony and “carefully investigated everything” (Luke 1:1-3). Peter reminded his readers that the disciples “were eyewitnesses of [Jesus’] majesty” and “did not follow cleverly invented stories” (2 Pet. 1:16). Truly, the Bible affirms the eyewitness credibility of its writers.
The external evidence test looks outside the texts themselves to ascertain the historical reliability of the historical events, geographical locations, and cultural consistency of the biblical texts. Unlike writings from other world religions which make no historical references or which fabricate histories, the Bible refers to historical events and assumes its historical accuracy. The Bible is not only the inspired Word of God, it is also a history book — and the historical assertions it makes have been proven time and again.
Prophecy, or predictive ability: The Bible records predictions of events that could not be known or predicted by chance or common sense. The many predictions of Christ’s birth, life and death (see below) were indisputably rendered more than a century before they occurred as proven by the Dead Sea Scrolls of Isaiah and other prophetic books as well as by the Septuagint translation, all dating from earlier than 100 B.C.
Since Christ is the culminating theme of the Old Testament and the Living Word of the New Testament, it should not surprise us that prophecies regarding Him outnumber any others. Many of these prophecies would have been impossible for Jesus to deliberately conspire to fulfill — such as His descent from Abraham, Isaac, and Jacob (Gen. 12:3; 17:19; Num. 24:21-24); His birth in Bethlehem (Mic. 5:2); His crucifixion with criminals (Isa. 53:12); the piercing of His hands and feet at the crucifixion (Ps. 22:16); the soldiers’ gambling for His clothes (Ps. 22:18); the piercing of His side and the fact that His bones were not broken at His death (Zech. 12:10; Ps. 34:20); and His burial among the rich (Isa. 53:9). Jesus also predicted His own death and resurrection (John 2:19-22).