إِنَّمَا الْأَعْمَالُ بِالنِّيَّاتِ، وَإِنَّمَا لِامْرِئٍ مَا نَوَى، فَمَنْ كَانَتْ هِجْرَتُهُ إِلَى اللَّهِ وَرَسُولِهِ، فَهِجْرَتُهُ إِلَى اللَّهِ وَرَسُولِهِ، وَمَنْ كَانَتْ هِجْرَتُهُ إِلَى دُنْيَا يُصِيبُهَا أَوِ امْرَأَةٍ يَتَزَوَّجُهَا، فَهِجْرَتُهُ إِلَى مَا هَاجَرَ إِلَيْهِ.
Actions depend upon intentions, and each person receives according to what they intended. Whoever migrates for Allah and His Messenger has migrated for Allah and His Messenger; whoever migrates for a worldly gain or to marry a woman has migrated for the purpose for which they migrated.
Source: al-Bukhari and Muslim (as cited in the book).
The report first states the general principle concerning deeds and intention. It then develops the same principle through migration. Two outwardly similar journeys can differ profoundly in their purpose. The wording follows the version printed in the source edition.
A small grammar point: إِنَّمَا adds emphasis and restriction; the prefix بِـ in بِالنِّيَّاتِ links deeds to intentions. These small elements are essential to the complete meaning.