He fisheth on that catcheth one.

Understand the thought

Meaning in plain English

A small success can encourage someone to continue an undertaking. The fishing image captures the motivation of a first result, while one success does not establish that repetition is worthwhile or guarantee that another result will follow.

What the words are saying

The person who catches one fish keeps fishing in the proverb’s scene. Figuratively, a concrete result can make further effort seem promising after a period of uncertainty. That encouragement is understandable, but the next attempt may face different conditions. A useful reading balances the value of what has worked with an honest view of what remains unknown. Continuing can be reasonable when the activity still serves a purpose and its costs are proportionate. The saying is not a fishing technique, a rule for repeated bets or a demand to persist regardless of losses. It notices motivation rather than proving the wisdom of every next step.

Everyday example

A tutor sees one learner understand a new exercise and decides to try it with the group, while checking whether the others find it useful too.

When to use it

Use it when a first result is helping someone decide whether to make another attempt.

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