Some years age I picked up a book by Einstein ; in the introduction was the following statement (from memory): [ If or unless, you have or have completed the second year of degree (university) then you will not or be able to understand …. (the book). ] At which point; I replaced the book!
I don't suppose for a second you can remember which of his many books and essays it was from?
It would be so much easier. I have tried, but can't find wording similar to what you've quoted albeit you are saying from memory - sometimes it's not as we remember at all.
I shall keep looking for you.
I don't want to get to the end of my life and find that I lived just the length of it. I want to have lived the width of it as well. - Diane Ackerman, quoted in "Newsweek"