“The future is now. It's time to grow up and be strong. Tomorrow may well be too late.”
Source: Reasons to Be Pretty
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Neil LaBute 1
Film director, playwright, screenwriter 1963Related quotes

“The time for action is now. It's never too late to do something.”
Quoted as Sandburg in Stop Whining! Start Selling!: Profit-Producing Strategies for Explosive Sales Results (2003) by Jeff Blackman, but without citation of original source; this is elsewhere attributed to Antoine de Saint Exupéry, but also with no original sources cited.
Disputed

1960s, Beyond Vietnam: A Time to Break Silence (1967)
Context: We are now faced with the fact that tomorrow is today. We are confronted with the fierce urgency of now. In this unfolding conundrum of life and history there is such a thing as being too late. Procrastination is still the thief of time. Life often leaves us standing bare, naked, and dejected with a lost opportunity. The tide in the affairs of men does not remain at flood — it ebbs. We may cry out desperately for time to pause in her passage, but time is adamant to every plea and rushes on. Over the bleached bones and jumbled residues of numerous civilizations are written the pathetic words, "Too late."

Ray Kurzweil: The Library Journal, The virtual book revisited http://www.kurzweilai.net/the-virtual-book-revisited