"We have not passed that subtle line between childhood and adulthood until we move from the passive voice to the active voice -- that is, until we have stopped saying "It got lost" and say "I lost it." Sydney J. Harris
How many times have you found yourself referring to "they" or someone else as a reason for your shortcomings? It a symbol of maturity when you own up to your own mistakes or delays, even though it may be tempting to blame the nebulous "other" for our failure to produce.
Take a pledge to use your active voice today and take clear responsibility for your actions. Admit "I was late" vs. "Traffic was bad." Or "I can't figure it out" vs. "This computer is acting up." The more your language speaks of maturity, the more your actions will follow.