Allah tells us that He is the One Who has subjugated the sea so that ships may sail on it by His com"See the full heading"Allah tells us that He is the One Who has subjugated the sea so thatships may sail on it by His command, i.e. , by His grace and power

For if He did not give the water the strength to carry the ships, they would not sail. So he says:

لِيُرِيَكُمْ مِّنْ ءَايَـتِهِ

This has been stated in the verse: وَلَوْ أَنَّمَا فِي الْأَرْ‌ضِ مِن شَجَرَ‌ةٍ أَقْلَامٌ (27) through a similitude. Says the similitude: 'If all trees that are on the earth were to be pens (or pens were to be made of all branches on them) and the ocean (converted into ink) is supported by seven seas following it, the words of Allah would (still) not come to an end.' The expression: کلمات اللہ (kalimatul-lah, i.e. the words of Allah) means His knowledge and wisdom (Ruh ul-Maani and Mazhari) which includes the manifestations of Divine power and Divine blessings. Then, the 'seven seas', referred to here, do not mean that there are seven seas present elsewhere. Instead of that, this is a manner of saying: Suppose if this ocean were to be replenished with seven more oceans, still then, all these words of Allah could not be committed to writing. Even the number of 'seven' appears here as a part of the example. No restriction is intended. Another verse of the Qur'an proves it. There it was said:

قُل لَّوْ كَانَ الْبَحْرُ‌ مِدَادًا لِّكَلِمَاتِ رَ‌بِّي لَنَفِدَ الْبَحْرُ‌ قَبْلَ أَن تَنفَدَ كَلِمَاتُ رَ‌بِّي وَلَوْ جِئْنَا بِمِثْلِهِ مَدَدًا