Those who need Oak are dutiful, reliable, steady people who struggle-on bravely, despite overwhelming odds. They may be unaware of their growing exhaustion and therefore never regain their strength. They are serious about their duties but need to step back and allow themselves time to recoup.
Negative emotion causing unhappiness:
Overworked / Tired / Serious / 'Brave struggle' / 'Workaholic'
Positive emotion encouraged by the Essence:
Strength / Recharged / Endurance