Saint Ignatius

Some indeed have tears naturally, when the higher motion of the soul makes itself felt in the lower, or because God our Lord, seeing that it would be good for them, allows them to melt into tears. But this does not mean that they have greater charity or that they are more effective than others who enjoy no tears.

Many of Judy Blume's books - which I devoured when I was growing up and where I found characters that were believable because they were a lot like me - caused considerable consternation when they were first published, but now they're widely accepted as an essential part of the children's literary canon.

I would absolutely recommend against excessive positivity and optimism. Any positive emotion that you're infusing into a workplace needs to be grounded in reality. If it's not realistic, sincere, meaningful, and individualized, it won't do much good.