For that sentence, persistence would fit best. "I never doubt my [persistence] for the thing I like most. I stick to it everyday." ~ I would say persistence is more about being constant. For example saying "I have shown great persistence in my studies." could mean that you have studied every night without missing a night. Someone could also show persistence when bothering someone, such as a little kid who keeps asking "Are we there yet?" and won't stop asking until they get to their destination. Peserverance is more about not giving up throughout hardships. Take for example, "The soldiers' perserverance paid off when they won the war." Even though the soldiers might have wanted to give up because of difficulties, they did not and kept fighting. This is perserverance, and in the end, a goal is usually achieved. Hope this helps! (:

Your sentence above cannot be inserted with any of the 2 words . Persistence for X Perseverance for X . Likely word is " preference for" My perseverance will ensure that I will get the things I want in the end . Perseverance > keep on doing something and bear the disappointment /failure along the way. My persistence will ensure that my parents will give in to my demands Persistence > keep on doing something without changing course , firm in what you do despite any setbacks or opposition.

Sorry, it is "persistence" because you said "stick" I never doubt my __persistence__ for the thing I like most. I stick to do it everyday.

I never doubt my __perseverance__ for the thing I like most. I stick to do it everyday.