The page goes like this:
As we all know the main reason we become unhappy is because our wishes are not fulfilled or we have to deal with an unpleasant situation. However, as Shantideva says in the Guide to the Bodhisattva’s Way of Life:
If something can be remedied
Why be unhappy about it?
And if there is no remedy for it,
There is still no point in being unhappy.
If there is a way to remedy an unpleasant, difficult situation, what point is there in being unhappy? On the other hand, if it is completely impossible to remedy the situation or to fulfill our wishes, there is also no reason to get upset, because how will becoming unhappy help?
This line of reasoning is useful because we can apply it to any situation. Wouldn’t you agree?