The answer is conditional and subjunctive moods.
The conditional mood is used to talk about improbable situations and circumstances which depend on some condition.
For example: <em>If all wars were ended, the world would be a happier place.</em>
The subjunctive mood is used to describe wishes and hypothetical conditions.
For instance: <em>I wish all wars were ended. </em>
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B, nature wishes to convince readers that understanding the natural world is more important than human relationships, while Society and Solitude is an attempt to warn readers against too much solitude.