If someone doesn’t Know, beyond doubt, that the Holy Spirit is within, then there are other lines of questioning that can lead to ‘Right Thinking’ about a situation. Just because we don’t Know, doesn’t mean we can’t Trust that He/She (Holy Spirit) is there and rooting for us, “Choose Me…You won’t find a better way to spend a lifetime.” But one must truly want to know what is in line with the Mind of Christ to get below surface answers.
Since the OP had the thought to ask a priest about sin/no sin of this action, then it may be the Holy Spirit who gave the ‘nudge’ to question it in the first place. But the role of a spiritual leader isn’t to make the determination for us, but to give guidance about how one can ‘see through the eyes of Christ’ rather than our own will or Ego’s push from behind to engage in a behavior, emotion or line of thinking.
Otherwise, we are either leaning on our own understanding (without the Holy Spirit or use of spiritual principles), or on the understanding of others, who may or may not know the Holy Spirit or be using spiritual principles. If someone can’t tell how they came to their position, then the chances are that spiritual principles weren’t part of the determination process - it’s opinion/leaning on one’s own understanding (or could even be the first priest’s intense fear of heights). Or if they read an article tonight about the topic, their position may change tomorrow. Opinions change; spiritual principles do not - they only grow deeper in our Understanding of them and application opportunities.
Tyypes of tools one can use if they don’t know the Holy Spirit personally (which still apply after one Knows the Holy Spirit):
Does this act, behavior, thought glorify Christ?
Does this a, b or t indulge in the pleasures of the flesh without regard for Christ and His will for me?
For instance, In checking motives and hidden motives, one might ask alongs the lines of:
Is this act an effort of the flesh to provide a point of pride or to obtain the esteem/respect of men?
Is it a means to stave off boredom? To add excitement to life/adrenalin rush?
Do underlying motives involve conquering fear in the wrong way, escaping feelings, or is it an act of defiance - daring the powers/principalities or God?
Do I know if skydiving would be sin/lack Wisdom for you? No. I could only share from my experience of thinking about engaging in skydiving (because my brothers enjoyed it), how my motives were suspect and the mind tools I used to come to the decision not to jump. Your motives may be different and ‘pass the test’.
I do the inner work to the best of my ability and keep moving forward. Practice, thus far, has not led to Perfect, but I endeavor to use the tools I’ve been taught that provide an anchor in the shifting tides of Ego’s influence and brings me more in line with the Goal.
Rigorous honesty isn’t easy but it’s worth it, from my experience.
One of my motivatons for considering skydiving had to do with dreams of flying as a child. No parachute, no plane - just arms out…up, up and away. I still don’t know what it means to have had such dreams that ‘stick in memory’, but I determined that skydiving would ultimately be a disappointment compared to the dream. There is a part of me that wants that unfettered freedom to soar, but now I think of it in terms of what it will be like when I’m no longer yoked/attached/grounded to the evil one within and am free to fly…with the Wings of Love. I feed Hope and keep doing my part to be made ‘white as snow’.