Our limited capacity to recall information consciously frequently causes long messages to be erroneously recollected, and therefore transmitted. This can be dealt with by condensing one's thoughts into short messages with impact, such as aphorisms and slogans. Not only does this facilitate memorization, but if the individual agrees with the idea being transmitted and likes the way it is depicted in the message, the message itself is more likely to be repeated and consequently memorized by more individuals (because repetition is important for memorization). It is also noteworthy that this tactic (the use of slogans) has been used by cults and political movements all over the world.
What I suggest is that we practice this by writing short messages about psychopolitical topics, sentences or groups of sentences that can be quoted in conversations, both online and in person. We should also look for quotes by famous people regarding the topic, and critique each other's messages.
Here are my attempts:
The most difficult and important part of learning is opening yourself to the possibility that what you know is wrong.
Naturally this does not apply to everyone. While study is meaningless if one is unwilling to accept that one's current knowledge is either insufficient or wrong (making the "important" part true), it can be more difficult to have access to some information than to accept it. Still, this was written with a particular demographic in mind: people interested in politics and science who have access to the internet, meaning that the access to a certain piece of information is unlikely to be the hardest part of learning. The use of "most" adds impact to the phrase, and the use of "you" instead of "one" makes it more personal.
Oversimplification is one of the most widely used and effective manipulation tactics.
The use of the word "manipulation" instead of "rhetoric" or something to that effect makes the message more dramatic and memorable. "most widely used and effective" also serves to cause the reader to look for examples around him, either to prove or disprove this, but either way paying more attention to his information environment. There is also a chance that the irony of oversimplifying such a statement can be perceived consciously and generate further discussion.
If you don't control your mind, someone else will. -John Allston
Here the author makes a warning, which is intended to draw alarm and inspire a change in behavior. Once again the use of "you" instead of "one" makes the message more personal, while the choice of the vague "someone" instead of a more specific and malignant agent allows the reader to insert his perceived threat/enemy in that role.
Sources:
http://www.douglaserice.com/memorable-slogans/
http://www.jar.warc.com/ArticleCenter/default.asp?ID=99032&Type=Article
http://psycnet.apa.org/psycinfo/1995-31346-001
http://www.tandfonline.com/doi/abs/10.1080/10641734.1994.10505018
http://psycnet.apa.org/journals/xhp/3/1/1/