"If He wills, He stills the wind, so they remain" - meaning the ships - "motionless" - [meaning] stationary - "on its back" - [meaning] on the back of the sea - "Indeed, in that are signs for every patient, grateful one" - meaning: for every believer.
﴿إِن يَشَأْ يُسْكِنِ الرِّياحَ فَيَظْلَلْنَ﴾ يَعْنِي: السفن ﴿رواكد﴾ سواكن ﴿على ظَهره﴾ على ظهر الْبَحْر ﴿إِنَّ فِي ذَلِكَ لآيَاتٍ لِكُلِّ صَبَّارٍ شَكُورٍ﴾ أَي: لكل مُؤمن