A conditional relates a consequence to a preceding condition. In «إن تجتهدْ تنجحْ», success is presented as consequent upon effort, not as a bare unconditional announcement of success.
To interpret a conditional, distinguish the protasis from its apodosis. The point is to present a consequence as bound to the specified situation.
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Al-Itlaq wa al-Taqyid: Rhetorical Functions of Unrestricted and Qualified Expression
A conditional relates a consequence to a preceding condition. In «إن تجتهدْ تنجحْ», success is presented as consequent upon effort, not as a bare unconditional announcement of success.
To interpret a conditional, distinguish the protasis from its apodosis. The point is to present a consequence as bound to the specified situation.