The Heart Center
The smallest motor, and the one that decides what you believe you are worth.
Defined Heart
You have consistent willpower and can make a promise and keep it by decision alone. Roughly a third of people have this, and they often do not realise the other two thirds cannot simply choose to have willpower.
Open or undefined Heart
Willpower is inconsistent, and that is correct rather than weak. An open Heart that keeps making promises to prove itself ends up exhausted and quietly ashamed, which is the most common suffering in this centre.
The not-self theme: Proving your worth. Making commitments you cannot reliably deliver, in order to feel like enough.
What an open Heart eventually becomes
An open Heart eventually stops bargaining for worth, and becomes genuinely wise about what things and people are actually worth.
This is the part most people miss. An open centre is not a deficiency to be fixed. It is where you take in and amplify other people, which is uncomfortable for years and then becomes the thing you understand better than anyone with it defined.
The gates of the Heart
4 of the 64 gates sit in this centre. Each is also a Gene Key, read as a Shadow, a Gift and a Siddhi rather than as a mechanic.
Centres, gates and channels come from the same tables the bodygraph is drawn from. Human Design was assembled in 1987; Six Mirrors reads it beside five older systems and shows where they agree.