2 adjectives to describe inspirer

Moral and religious enthusiasm, though undoubtedly poetical emotions, are at the same time but dangerous inspirers of poetry; nothing being so apt to run into interminable dulness or mellifluous extravagance, without giving the unfortunate author the slightest intimation of his danger.

O, my lord! cried he, as soon as he had done perusing it, how much do you over-rate the little merit I am master of, yet how little regard a passion which is the sole inspirer of it!

2 adjectives to describe  inspirer