The Holy Prophet (sa) and His Station as the Seal of the Prophets
Allah the Exalted has blessed us with a prophet who is the Seal of the Believers, the Seal of the Pious, and the Seal of the Prophets. Similarly, God Almighty revealed upon him a book, which is the Seal of Books — a book which comprehensively encapsulates all others. When it is said that the Messenger of Allah (sa) is the ‘Seal of the Prophets’ and that prophethood has reached its end in him, this does not imply that prophethood has ended as one brings about the end of someone by strangling them to death. This sort of an ‘end’ is not worthy of honour. In fact, when it is said that prophethood has come to an end in the Messenger of Allah (sa) this means that the excellences of prophethood have reached their climax in his person. In other words, all the various excellences that were granted to the prophets, from Adam (as) to Jesus (as) son of Mary — certain qualities to some and different qualities to others — were all combined in the Holy Prophet (sa) and in this way the Holy Prophet (sa) naturally became the Seal of the Prophets. In the same manner, all the teachings, guidance and insights given in various books, came to their final point of completion when they culminated in the Holy Qur’an, and so the Holy Qur’an became the ‘Seal of the Books’. 
- The Promised Messiah (as) Malfuzat-Volume 2, (Tilford, Surrey: Islam International Publications Ltd., 2019), 58.