The spelling of "hath all oneself" may seem a bit unusual, but it can be explained using the International Phonetic Alphabet (IPA). In IPA, "hath" is pronounced as /hæθ/, "all" is pronounced as /ɔːl/, and "oneself" is pronounced as /wʌnˈsɛlf/. Combining these sounds produces the complete pronunciation: /hæθ ɔːl wʌnˈsɛlf/. This archaic phrase means "have all to oneself," and despite its odd spelling, it remains a valid expression in modern English.