Interpretation of verse 5-16
Dori appears to be the abbreviation of Teodori. God is telling us how important the Service is for the salvation of mankind.
Definitions:
Kore: this
Saika: quickly
Hayaku: quickly
Satori: understanding
Tsuita: come upon
Nani: whatever
Tsuitemo: happens, occurs
Mina: all
Kono: this
Teodori: Service, Joyous Service