النَّجَاحُ قَرِيبٌ. النَّجَاحُ غَيْرُ بَعِيدٍ.
Success is near. Success is not far away.
The latter assertion restates the former with closely related wording. When the intention is reinforcement, complete connection through emphasis makes separation suitable. Yet near-synonymy alone does not force that diagnosis in every context; both assertions might be deliberately independent.
To distinguish emphasis from substitution, ask whether the second merely strengthens the first proposition or supplies a more precise expression of what the first only broadly stated. The reason for faṣl is different in the two cases.