Recently, I saw this as a quote from the Friedicker Rebbe, RYI Schneersohn OBM on a Chabad Calendar.
It triggered a few random thoughts
First after learning Rambam's Hilchos Teshuva, I humorously quipped: "it may be summed up in 3 words: 'Do Teshuva Now!'"
Now I realized that I was mechavein to an even pithier summary,
Viz. "Teshuva Now!"
Then it occurred to me:
What if the whole world did a complete Teshuva would it:
• Bring the Moshiach instantly?
• Or would we have geulah and Moshiach zeit even w/o a Moshiach - IOW would worldwide Teshuva obviate the need for a Moshiach?
Either way, it's a win-win option.