In the course of my life I have come up with a list of "unfortunate truths" that tend to explain a lot of what I see happening around me. They are somewhat negative, hence the word "unfortunate". I don't exclude myself from being subject to these rules. Don't take personal offense at any of these, as I don't mean them in a mean-spirited way. I am sure you are the exception to the rule.
Unfortunate Truth Number One (UT1): People are idiots. (as I say, I definitely include myself here)
UT2: People rarely do what they assure you they will do. The more insistently they assure you, the less likely it is that it will occur.
UT3: Nothing is ever as important to the other person as it is to you.
UT4: Entropy and adversity forever increase.
UT5: People don't want to hear the truth; they want you to tell them what they want to hear, and then make it true.
UT6: Any solved problem creates new problems.
While I would like to come up with a list of "Fortunate Truths" someday, the above list probably explains why I haven't.