Graves was reportedly distressed by the poor reception given to Abraham Maslow at an American Psychological Association seminar in the mid 1950s and determined not to publish his full theory until he was confident he could defend it. Due to a brain injury sustained in 1975, Graves abandoned his book manuscript in 1977. The manuscript, consisting of largely complete drafts of sections describing the derivation of the theory from experimental data, and comparing it to other theories, was edited together with other primary sources to reconstruct the missing section on the nature of the levels, and published posthumously in 2005 as "The Never Ending Quest".