If one said, for example, "I will not hear evil" with the intention of not listening to offensive music, what has he forbidden himself from?

Can such a general statement go into effect? If so, what if the statement was as general as, "I will not sin?"

Is it possible that it does not go into effect because his intention does not match the implication of his words -- that he will not hear any evil?

If it does go into effect, has he only forbidden himself from music as he intended, or has he also forbidden himself from things such as lashon hara as implied by his verbal statement?

If one said, for example, "I will not engage in unnecessary talk" with the intention of not excessively talking about unimportant things but not to completely forbid it, what has he forbidden himself from?

Can such a general statement go into effect? If so, what if the statement were even more general, that it would be almost impossible to avoid, such as "I will not smile?"

Is it possible that it does not go into effect because his intention does not match the implication of his words -- that he will not talk any words that are not absolutely necessary?

If it does go into effect, has he only forbidden himself from what he intended, or has he also forbidden himself from whatever was implied by his verbal statement?