vidya, here is a start to the art of NO and saying it with no guilt
We say "yes"to others because we want to please them. But when eventually we can't continue, we let them down and we feel guilty. Both parties suffer[In this case, its clearly only you]. Recognize that a desire to please often prevents us from saying no. But in reality we never would be able to please everyone.
Be firm -- not defensive or overly apologetic -- and polite. This gives the signal that you are sympathetic, but will not easily change your mind if pressured. Phrase your "no" as simply as possible. Don't raise your voice or become upset, simply say that you cannot help this time. When you say no, say it in a confident, well modulated voice to sound more straightforward.
Don't feel obligated to explain. You have your reasons and they may not be ones you wish to discuss. If this is the case, try saying something like what I have said earlier, that you need to grind something, vaccum is broken etc. Leave it at that - if you must, change the subject.
Stand firm. If the requestor does not want to accept your answer, tell him or her that your mind is made up and that you will not change it. Be firm, thats most important.
Be respectful. Even if the person asking isn't. If your refusal upsets someone, remain calm and, if possible, remove yourself from the situation.
Saying no can be good for you. Saying no is not a selfish act. In fact, it may be the most beneficial thing that you can do for your family and your other commitments. When you say no, you'll be able to spend quality time on the things you've already said yes to. You spent the hard earned money right? What if it really gets broken. We need to think about our situation as well. We can be good beighbors guiding them, not providing them everything for them to lead a normal life.
More importantly, because of this not able to say NO, you are under a lot of stress, you've got a much better chance of becoming sick, tired or just plain crabby, which won't benefit you or anyone else. See you helped her, but it not give you any peace. So what is the point?
No. Nope. Nah. See how simple it is to say one little word, allowing you to take a pass on nonpriorities? Of course, there are always instances when it's just not that easy. Here are some things to keep in mind when you need to say no:
Saying no won't be easy if you're used to saying yes all the time. But learning to say no is an important part of simplifying your way to a better, less stressful life.
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