Does it come from what you need to do, what you have to do, what you want to do, what you love to do? Answer - All of the above.
Here I will use Abraham Maslow's research into human psychology and the development of the hierarchy of needs to explain. For me, the needs pyramid made sense, it was simple and it is still very relevant to what motivates us.
The Needs Pyramid was broken into 5 -
At the base, there are the basic needs, we all need - food, drink, warmth, shelter, sex, sleep... this is followed by safety needs, we all want protection, security, stability and the hierarchy moves to love and belonging to self esteem, i.e. status, reputation, responsibility and the tip of Maslow Hierarchy is self actualisation described as personal growth and fulfilment.
To me this is not linear, not an hierarchy, that is, once you have one, you can move up the pyramid to the next one and so on. The needs mingle together and the focus of my motivation will change, dependent on if that need is being met.
The Simple becomes Interesting
This is where the simple becomes very interesting, I know if I stayed at the basic needs, just motivated to work to satisfy the needs of just being alive, the things I need to have, the food to eat, the house to live in, I know that would not keep me motivated. It would not propel me through the day.
The areas of this pyramid of Want To and Love To are what inspire us to set the WHY in our life, figure out the WHAT and the HOW to improve our status, build our relationships and see our lives grow and experience fulfilment.
Our life is full of NeedToHaveToWantToLoveTo, just make more space for the Love To.