Act 1 - Destiny

The witches play a significant role in the play because they influence Macbeth’s actions, which then affect other characters throughout the play. The witches’ prophecies awake Macbeth’s ambition, which leads to the plan to murder King Duncan, and then Banquo later on in the play. The witches appear to be letting Macbeth know his fate, but then his interpretation of the witches’ prophecy cause him to act, which is not necessarily truly fate. The play causes the audience to question whether Macbeth was truly meant by destiny to become king, or if solely his actions led him to become king. There is also a sense in the play that Macbeth is truly not meant to be king, at least not for long, because Macbeth tries to get the throne by murdering King Duncan. Macbeth is not supposed to inherit the throne since he is not the rightful heir. In away, Macbeth is tampering with the divine right of the king to rule, and so his eagerness to get the throne is actually fighting against notions of order and fate.

I think we all are not subject to our pre-determined destiny, unless one allows their lives to naturally pass without putting much effort into it, then one will become what their pre-determined destiny wants them to be. Everyone has their destiny in their hands. It is up to us to choose what to do with it. Some will take their lives seriously and make changes to it, and some will let it go and let destiny take them. Destiny is like a guide that will take us to a certain path, but it is up to us to decide which direction we want to go from there. We can influence our future and destiny by making changes in our life. Even one slight change may not seem to have a significant effect, however, when every change accumulates in our life then it can have a momentous impact on our future. If we put effort in changing our destiny then we can influence it. 

Reference:
http://www.bridgemanart.com/en-GB/news-and-features/collection-highlights/2009/july/shakespeare%20in%20the%20park-1