Something very special and powerful happens when you deliver a message in chunks of 3, whether in written form or orally.
Even Julius Caesar proclaimed “Veni, vidi, vici” (I came, I saw, I conquered). More recently, in his Iowa Caucus Victory Speech, Barack Obama rallied the crowd with such examples as “block by block, brick by brick, callous hand by callous hand”.
In its simplest form the rule of 3 works because it states, it emphasises, and then makes it more memorable.
Use tripling for the first words of a presentation to grab the attention of your audience or in written communication to make your point more convincing.
Among the other oratory/writing techniques tripling works so well because it enables you to present, build up and then drive home your message.