Philosophical Banes: Confusion, Frustration, and Emotion

Confused: Being unable to think with clarity or act with understanding and intelligence.

Being confused often results from a lack scrupulous logical deliberation.

Frustrate: To cause feelings of discouragement or bafflement in.

What about when 'scrupulous logical deliberation' continuely frustrates your ability to come to a conclusion?

Feelings: Opinion based more on emotion than on reason; sentiment.

When should what you determine be a result of feelings?