Wiktionary
forget oneself
vb. (context idiomatic English) to lose one's dignity, temper, or self-control.
Usage examples of "forget oneself".
With a sense of detachment, he let himself remember how it was to tangle too many limbs to count, to be mindless flesh, to forget oneself in drunken laughter and faceless warmth.
How easy it was to forget oneself, forget to respect this tragic creature.
It is easy to forget oneself at moments of concentration, and his copying is careful and devoted.
That answer is: one must live in the needs of the day-that is forget oneself.