You know the old saying, "When life hands you a lemon, make lemonade." The reason cheesy sayings like that have transferred from generation to generation is because the principles they hold are vital to our existence. If everyone was negative, we couldn't possibly live that way. We all have different people in our lives. Some are the ones that we go to to get encouraged and some are the ones we stay away from to avoid discouragement. There's some that will be straight with you and some that will just tell you what you want to hear. I personally want to be a "positive" person. There's a balance that the word positive holds of being encouraging, and yet being able to be truthful at the same time. It's not denying that I have a lemon, but simply asking how can I turn the lemon into a good situation. It's hard to be happy and smiley all the time, and in fact, I'm pretty suspicious of people who are like that every time I see them. They scare me. Being positive is about not giving up on good and not giving in to negativity and pessimism. Galatians 6:9 says, "Let us not become weary in doing good...". God is faithful and is still in control, and that's where we get the strength to turn a negative into a positive.
Here's a great example of that...Josh Wilson, a Christian artist, turned a tense situation of an airport lock down into a positive one.
I first saw this on some major news stations and programs, so props to Josh for being a positive light for Christ, instead of the embarrassing ignorance that is usually broadcast of the Christian culture.