This mantra comes from Og Mandino's The Greatest Salesman in the World (1968). In the book, a camel boy named Hafid is given ten ancient scrolls, each holding one principle of success, and is told to read each scroll three times a day for thirty days before moving to the next, so that its words sink in as habit. The ninth scroll is about action: dreams, plans, and goals are worth nothing until they're acted on, and its answer is a phrase repeated until it becomes a reflex: I will act now.

I first wrote down my own version of the scroll in 2014, shorter and in my own words. This is my revision:

I will act now.
I will act now.
I will act now.

Henceforth, I will repeat these words each hour, each day, every day, until the words become as much a habit as my breathing, and the action which follows becomes as instinctive as blinking. With these words, I will condition my mind to perform every action necessary for my success.

I will act now for now is all I have. Tomorrow is the day reserved for the lazy. I am not lazy.

I will act now.
Now is the time.
This is the place.
I am the person.