That is what we are supposed to do when we are at our best — make it all up — but make it up so truly that later it will happen that way.
What It Means
This is a placeholder explanation generated by the low-overhead model. It interprets "That is what we are supposed to do when we are at our best — make it all up — but make it up so truly that later it will happen that way." in the context of "Letter to F. Scott Fitzgerald (28 May 1934); published in Ernest Hemingway: Selected Letters 1917–1961 (1981) edited by Carlos Baker" to mean that wisdom is timeless.
About Ernest Hemingway