Am I Hearing the Holy Spirit or the Evil Spirit?

On this Pentecost Sunday, the Church gives us as a second reading Paul's list of the fruits of the Holy Spirit: love, joy, peace, patience, kindness, generosity, self-control, etc. These are the signs that accompany the Holy Spirit. St. Ignatius of Loyola, in his "Rules for the Discernment of Spirits," gives us something very similar: A basis for how we can tell whether it is the Holy Spirit we are listening to or the Evil Spirit.