The image is more vibrant than passive, more dynamic than soothing. When the Holy Spirit appeared as a dove, when Jesus was baptized, He was there to show the reality of the love between the Father and the Son. And so God send him an angel who took a burning coal from before his altar and touched the coal to Isaiah's lips to purify him. There is no way that you or I can provide for ourselves the power of purification that comes from the sacraments of the Church. Secondly, the purification is brought to us by an emissary chosen by God.
Purification is painful.
It might very well be that situation you hate the most or the disappointment that has you enraged or the sickness, the failure, or even the person who rankles the most might very well be the means of your purification and your salvation. And now, Fruit. Fruit doesn't appear overnight. First, seeds have to be sown. Then they need to be watered and nurtured, and tended.