Be Open Minded
When you are going on a first date, try to embrace what life brings, rather then expecting your criteria to match.
The reason why it is important, is that if you are open minded then you most likely are going to be surprised when learning something you did not expect about a person you are meeting. If you have high expectations then you will be focusing on your list of requirements and you will miss something about the person that could be more valuable then any parameters in your criteria.
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Trust that every person is unique. We learn from every person we meet. There is a reason for everything that happens, we only get to understand that reason later on.