Whether you believe or not, we do have our own limitations. However, I should first clarify that these limitations are not hard limits, they are soft in the sense that they can be stretched by continual effort. But anyhow, we could not stretch too much.
With that in mind, we will be far more relaxed in our life. We all want the best, but in the practical situation, whether it is possible or not, we need to think.
Limitation is somehow good for limited beings. We have more than one role in our life, but then if you always want to strike for the best, you are going to give up something else! Guess what, the first one who is going to suffer is usually the ones who are so close to you, like your significant half or your family members. Remember, life is not for task but it's the reverse! Relationship could be built, but once it was damaged, you need far more effort to rebuild it (with a scar).