Underhill on What to Trust When Responding to the Holy Spirit's Call

From Evelyn Underhill, The Spiritual Life, via Readings for Reflection in A Guide to Prayer:

…our own feelings and preferences are very poor guides when it comes to the robust realities and stern demands of the Spirit.

…the spiritual life does not consist in mere individual betterment, or assiduous attention to one's own soul, but in a free and unconditional response to that Spirit's pressure and call, whatever the cost may be. 

So much for "if it feels good and I like it, then God must like it, too."