1 Kings 1:5-7

1 Kings 1:5-7King James Version (KJV)
5 Then Adonijah the son of Haggith exalted himself, saying, I will be king: and he prepared him chariots and horsemen, and fifty men to run before him.
6 And his father had not displeased him at any time in saying, Why hast thou done so? and he also was a very goodly man; and his mother bare him after Absalom.
7 And he conferred with Joab the son of Zeruiah, and with Abiathar the priest: and they following Adonijah helped him.

An American English Bible

5 Well, AdoniJah (the son of [David's woman] AgGith) tried to elevate himself, saying, 'I will be the king.' So he prepared himself [by collecting] chariots and horses, and having fifty men run ahead of him. 6 [David] never discouraged him or asked, 'Why are you doing this?'
Now, AdoniJah was a very handsome man (his mother had given birth to him after AbSalom). 7 Then he met with JoAb (the son of ZeruJah) and AbiAthar the Priest, and they became his supporters.

These are my thoughts, please share yours.

5 Adonijah was David’s son, his 4th son, Amnon the eldest was dead, and Absalom his third child killed the oldest and died in battle, the second child named Chileab also named as David was not even a contender for the throne for some reason, Adonijah may have felt a right to the throne the problem was his father David was still king. He was unwilling to wait fro the time which would not have been long, because David did not have much longer to live but he decided to take the kingdom by force. Sometimes we are not willing to wait our time and push ahead and end up hurting ourselves and others by doing this it also separates us from God too.

6 David may have seen things happening but due to his condition may have chosen not to say anything. To many we let things happen that could have been stopped by saying something earlier. To many times the church allows something in that is negative and wait till it becomes a big problem to do something about it, if the little problems were taken care right away there would be no big problems.

7 Joab was the commander of the army and David’s nephew as well. So his plan was to get the faith and military behind him over take the kingdom but even by getting the priest he did not have God behind him. He may have even had a backup plan if he could not over take the kingdom he may have been willing to set up his own kingdom.