He must crack the nut that would eat the kernel.

Understand the thought

Meaning in plain English

A desired benefit may require doing the necessary work to reach it. Cracking the nut before eating its kernel links a result to its practical prerequisite, without promising that any amount of effort guarantees success.

What the words are saying

The kernel is enclosed, so the image gives the person who wants it something to do before enjoying it. Applied to a task, the saying can ask whether a necessary step has been recognised instead of wishing for the outcome while avoiding its preparation. The step still needs to be useful and proportionate: effort directed at the wrong obstacle may not help. Support, tools or a different approach may also be needed. This is the same broad idea as the archive’s reversed wording about eating the kernel and cracking the nut, rather than a separate historical discovery or a guarantee that work always brings a reward.

Everyday example

A group wants to exhibit in a community hall, so its organiser completes the required booking information instead of assuming interest alone reserves the space.

When to use it

Use it when a wanted result depends on a practical step that has not yet been taken.

Agent-assisted editorial interpretation. This explains the words; it does not by itself verify their author or earliest origin.