People sometimes may not get results for many reasons. Few of them are like - 

1. Verification and testing the credibility of spiritual events.
2. Lack of trust, faith and Surrender
3. Dilemma in faith 
4. Judgemental mind
5. Finding of much logic with analysis in spirituality 
6. Easily changing minds with little obstacles 
7. Sometimes, not obeying instructions of spiritual teacher.
8. Resistance from inside 
9. Astrological aspects 
10. Doubts
11. Resistance from already taken remedies.
12. Wrong demands and Unclear minds.
13. Pre-set fear
14. Pitru dosh and Matru dosh
15. Curse in the family - Shrapit dosh.