This is one of the many thought patterns that I use to help me live an amazing life. Allowing situations to be what they are is so key to reducing stress and increasing productivity. So many people spend their energy upset and complaining about why a situation is not to their liking. The only effect that this has is to raise their own stress level. We all know what a prolonged raise in stress can do to us both mentally as well as physically.
Allowing situations to be as they are does not mean you allow yourself to be victim to those situations. Quite the opposite. Fighting against the reality of the situation is like swimming against a current. You may certainly wish the river was flowing in the opposite direction. You can even complain that it is not. Neither of these will change the situation of the river, or more importantly, your situation. Conversely, accepting the river is going in the opposite direction you may want to go, and then making the best of it, may be getting out of the river and walking on the shore. Sure, it might not be as quick as if you were in a river flowing in the right direction, but it will be a lot less stressful, and a lot more productive, than swimming against the current.
In your own life, there are many situations that we wish were different. Accepting them for what they are, followed by asking ourselves how we can make the best of them is a secret to an amazing life.