He that runs fast will not run long.

Understand the thought

Meaning in plain English

A very intense pace may be difficult to sustain over a long task. Match the effort to the distance ahead rather than assuming that the fastest start produces the best overall result.

What the words are saying

The runner represents someone beginning with great speed but limited capacity to continue at that rate. Beyond running, the image can apply to a long project, repeated work or an extended commitment. It asks whether the chosen pace leaves a workable way to carry on. The saying is not a training rule or a claim about every fast worker. Skill, support and the task’s length affect what is possible. The useful distinction is between a burst suited to a short need and a pattern that must be maintained, including room for changes and appropriate relief.

Everyday example

A volunteer preparing a catalogue spreads checking work across several sessions instead of attempting an exhausting first day and abandoning the remaining entries.

When to use it

Use it when a long task needs a sustainable pace rather than only an energetic opening.

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