Full Idea
Divine eternity is the all-at-once [tota simul] and complete possession of unending life.
Gist of Idea
Divine eternity is the all-at-once and complete possession of unending life
Source
Boethius (The Consolations of Philosophy [c.520], V.6), quoted by Robert Pasnau - Metaphysical Themes 1274-1671 18.1
Book Reference
Pasnau,Robert: 'Metaphysical Themes 1274-1671' [OUP 2011], p.376
A Reaction
This is a famous definition, and 'tota simul' became the phrase used for 'entia successiva', such as a day, or the Olympic Games.