Prosper, Flourish
A Viking with enough trees will prosper. Vikings need trees to build their boats and homes, and they flourish when they have enough.
Picture a village of Vikings, flourishing and prospering because they live right on the edge of a forest they can just hack away at whenever they need a new ship.
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Vikings knew that in order to prosper they also needed to collect acorns (えい). If you're chopping down trees all the time, you need to actively grow them back too. That's why acorns are the actual, secret key to Viking prosperity.
Picture a bunch of kid Vikings planting acorns in rows and watching them flourish and grow into big trees that they can cut down to keep up their Viking ways.