What is the secret cause of the pulsing heart?

It is your spirit, which pulses, and magnetism―or spiritual flame is the motive power. 

And so your heart beats and will keep on beating while the eternal ages roll.

You are now getting at the great pulsing heart of all things―

The eternal motive power―

The motive power is the little invisible flame called magnetism. 

Now magnetism is a pure, invisible, spiritual flame―or in other words, the vast ocean of spirit and matter are counterparts. 

Each little flame of magnetism attracts and holds an equal proportion of matter, which makes a perfect atom. 

The little flame is the central point―or nucleus of the atom, and the coalescing of the two principles―matter and magnetism―generate heat―or, the little magnetic flame within the atom heats the atom to a white heat―therefore, heat is the coalescing of magnetism and matter, and thus worlds are formed. 

But atoms―nor worlds―never cease in their motion―they forever obey the great law of magnetic attraction, and the magnetic body within you, which animates the electric body and forever hides within it, is the secret cause of the pulsing heart. 

―Angel Galen