'I suppose the world has heard of the famous Solomon Eagle, an enthusiast. He, though not infected at all but in his head, went about denouncing of judgment upon the city in a frightful manner, sometimes quite naked, and with a pan of burning charcoal on his head. What he said, or pretended, indeed I could not learn.'
This event is corroborated in the 29 July 1667 entry of the Diary of Samuel Pepys (vol 13). Pepys confirms that the person described as such is a Quaker.
'…a man, a Quaker, came naked through the [Westminster] Hall, only very civilly tied about the privates to avoid scandal, and with a chafing-dish of fire and brimstone burning upon his head… crying, “Repent! repent!'
Eccles was a Quaker, a man prosecuted numerous times during the Restoration for civil disobedience. He would worship with other Quakers. The law that was passed in the early 1660s said that, if more than three people got together in a room for religious worship, this was a seditious, wicked activity. In May 1665, Eccles was arrested in Southwark, even though he probably lived in the middle of the City of London, and was put away in prison – probably in the Clink on the South Bank – for about two to three months.
Few if any of his works are extant since, when he became a Quaker, he burned all his books and compositions so as to distance himself from church music. Believing music to be a sinful vanity, he initially sold the compositions and his instruments, before taking them back and burning them to prevent the purchaser falling into sin. His repugnance for the organised church was reflected in the Quaker name for church buildings in his time: "steeple-houses".
He is credited as the author of the tract "A Musick-Lector" from 1667.