Tafsir Ibn Kathir -> Surah Al-Jathiyah -> The Subjugation of the Sea, etc., is among Allah's Signs

Allah the Exalted mentions some of the favors He gave to His servants, such as subjecting the sea for their service,

﴿لِتَجْرِىَ الْفُلْكُ فِيهِ بِأَمْرِهِ﴾

(that ships may sail through the sea by His command,) i.e., of Allah the Exalted, Who ordered the sea to carry ships,

﴿وَلِتَبْتَغُواْ مِن فَضْلِهِ﴾

(and that you may seek of His bounty,) in commercial and business transactions,

﴿وَلَعَلَّكُمْ تَشْكُرُونَ﴾

(and that you may be thankful.) for earning various provisions brought to you from far away provinces and distant areas through the sea. Allah the Exalted said,

﴿وَسَخَّرَ لَكُمْ مَّا فِى السَّمَـوَتِ وَمَا فِى الاٌّرْضِ﴾

(And has subjected to you all that is in the heavens and all that is on the earth;) the stars, the mountains, the seas, the rivers and all that you use for your benefit; these are all from His favor, kindness and bounty. Allah's statement next,

﴿جَمِيعاً مِّنْهُ﴾

(it is all from Him.) Alone without partners in giving any of it. Allah the Exalted said in another Ayah,

﴿وَمَا بِكُم مِّن نِّعْمَةٍ فَمِنَ اللَّهِ ثُمَّ إِذَا مَسَّكُمُ الضُّرُّ فَإِلَيْهِ تَجْـَرُونَ ﴾

(And whatever of blessings you have, it is from Allah. Then, when harm touches you unto Him you cry aloud for help.) (16:53) Ibn Jarir recorded that Al-`Awfi reported that Ibn `Abbas said about Allah's statement,

﴿وَسَخَّرَ لَكُمْ مَّا فِى السَّمَـوَتِ وَمَا فِى الاٌّرْضِ جَمِيعاً مِّنْهُ﴾

(And has subjected to you all that is in the heavens and all that is on the earth; it is all from Him.) "Everything is from Allah, and that is a Name from His Names. So it all comes from Him without rivals to dispute His authority; surely, this fact is completely certain.'' Allah said.

﴿إِنَّ فِى ذلِكَ لآيَـتٍ لِّقَوْمٍ يَتَفَكَّرُونَ﴾

(Verily, in it are signs for a people who think deeply.)