The way to a happier life may well start by understanding ‘the proper way of impressions.’
As a mentor he would instruct us to do our best and do no harm.
Epictetus taught his students the fundamentals which are understood through the best physics of the day.
Today there is a better understanding of cosmology, quantum theory and consciousness theory.
As to how this applies to self knowledge there is more areas to apply this understanding today.
For instance, it is necessary to be here today to the best of my knowledge and that will help me face it with the virtue of courage, contemplation, compassion and self awareness.
Good people are helpful.
Who can teach you to live the good life: Epictetus?