Ah, I see. Well, I think what I meant whhen I said that our actions and choices have no influence on the Holy Spirit, I meant that the Holy Spirit is a 'gift'. So by going out and drinking the night before a sermon, I think that qualifies as 'refusing' the gift.
In this sample scenario, the pastor decides, maybe I should go out tonight. The Holy Spirit would have prompted him (this is all theoretical, God may WANT the pastor to meet someone at the bar!) not to go. If he denied that, then that choice, yes, would affect him. But it does not affect the 'power' of the Holy Spirit, merely the relationship between the Holy Spirit (God) and the person. The man can say "I have weakened the power of the Holy Spirit by my actions!" but it would not be true. It is only man that is weak, which is why having a weak spiritual leader is dangerous. It can give people the impression that because a holy man is weak, then God has weaknesses as well.