I had a masters degree and 6 years of tech experience in the Israeli Defense Force, and I thought I was god's gift to tech companies. Being rejected by Google fixed my arrogance for me. Working with some excellent people at another startup also helped me show some humility.
"The eleventh commandment was `Thou Shalt Compute' or `Thou Shalt Not Compute' -- I forget which." -- Epigrams in Programming, ACM SIGPLAN Sept. 1982