I just wanted to make up a quick summation of the enneagram core motivations (because, to me, that's the basis of it all) and present it in a way that's easy to read and compare quickly between types.
I have a feeling this may have been made before, but I didn't do a completely comprehensive search. This is from the enneagram institute pages and from Timeless' descriptions of the types.
You can also find a summary here: The Enneagram is a model of nine worldviews and motivations
Type One - I will be secure if I'm perfect.
Type Two - I will be secure if I'm loved, appreciated or respected.
Type Three - I will be secure if I am successful.
Type Four - I will be secure if I am unique.
Type Five - I will be secure if I withdraw from harm.
Type Six - I will be secure if I am always aware of danger.
Type Seven - I will be secure if I can plan for the future.
Type Eight - I will be secure if I can control the world around me.
Type Nine - I will be secure if I have peace.
Basic Fear: Of being unwanted, unworthy of being loved
Basic Desire: To feel loved
Key Motivations: Want to be loved, to express their feelings for others, to be needed and appreciated, to get others to respond to them, to vindicate their claims about themselves.
Holy Idea: Freedom
Basic Drive: To make their ideal image into a reality
Basic Fear: Of being worthless
Basic Desire: To feel valuable and worthwhile
Key Motivations: Want to be affirmed, to distinguish themselves from others, to have attention, to be admired, and to impress others.
Holy Idea: Hope
Basic Drive: To be successful
Basic Fear: That they have no identity or personal significance
Basic Desire: To find themselves and their significance (to create an identity)
Key Motivations: Want to express themselves and their individuality, to create and surround themselves with beauty, to maintain certain moods and feelings, to withdraw to protect their self-image, to take care of emotional needs before attending to anything else, to attract a "rescuer."
Holy Idea: Origin
Virtue: Equanimity (calmness and composure)
Basic Drive: Isolation vs. Connection
Basic Fear: Being useless, helpless, or incapable
Basic Desire: To be capable and competent
Key Motivations: Want to possess knowledge, to understand the environment, to have everything figured out as a way of defending the self from threats from the environment.
Holy Idea: Omniscience
Basic Drive: Conservation of Resources
Basic Fear: Of being without support and guidance
Basic Desire: To have security and support
Key Motivations: Want to have security, to feel supported by others, to have certitude and reassurance, to test the attitudes of others toward them, to fight against anxiety and insecurity.
Holy Idea: Faith
Basic Drive: Survival
Basic Fear: Of being deprived and in pain
Basic Desire: To be satisfied and contentto have their needs fulfilled
Key Motivations: Want to maintain their freedom and happiness, to avoid missing out on worthwhile experiences, to keep themselves excited and occupied, to avoid and discharge pain.
Holy Idea: Planning
Basic Drive: Pleasure versus Pain
Basic Fear: Of being harmed or controlled by others
Basic Desire: To protect themselves (to be in control of their own life and destiny)
Key Motivations: Want to be self-reliant, to prove their strength and resist weakness, to be important in their world, to dominate the environment, and to stay in control of their situation.
Holy Idea: Innocence/Truth
Basic Drive: Survival (edit: since this is the same as a 6's drive, I'd suggest that the basic drive for an 8 is securing resources?)
Basic Fear: Of loss and separation
Basic Desire: To have inner stability "peace of mind"
Key Motivations: Want to create harmony in their environment, to avoid conflicts and tension, to preserve things as they are, to resist whatever would upset or disturb them.
Holy Idea: Love
Basic Drive: Peace
Basic Fear: Of being corrupt/evil, defective
Basic Desire: To be good, to have integrity, to be balanced
Key Motivations: Want to be right, to strive higher and improve everything, to be consistent with their ideals, to justify themselves, to be beyond criticism so as not to be condemned by anyone.
Holy Idea: Perfection
Virtue: Right Action
Basic Drive: To be incorruptible