Suuratul – Luqmaan Verse 30.
ذَٰلِكَ بِأَنَّ ٱللَّـهَ هُوَ ٱلْحَقُّ وَأَنَّ مَا يَدْعُونَ مِن دُونِهِ ٱلْبَـٰطِلُ وَأَنَّ ٱللَّـهَ هُوَ ٱلْعَلِىُّ ٱلْكَبِيرُ ﴿٣٠
30. That is because Allah, He is the Truth, and that which they invoke besides Him is Al-Batil (falsehood and all other false deities), and that Allah, He is the Most High, the Most Great.
Tafsir Ibn Kathir Volume 7, Page 594.
He shows you His Signs so that you may know from them that He is the Truth, i.e. He truly exists and is truly divine, and that all else besides Him is falsehood. He has no need of anything else, but everything else is dependent on Him, because everything in heaven and on earth is created by Him and is enslaved by Him; none of them could move even an atom’s weight except with His permission. If all the people of heaven and earth were to come together to create a fly, they would not be able to do so. Allah says:
﴿ذَلِكَ بِأَنَّ اللَّهَ هُوَ الْحَقُّ وَأَنَّ مَا يَدْعُونَ مِن دُونِهِ الْبَـطِلُ وَأَنَّ اللَّهَ هُوَ الْعَلِىُّ الْكَبِيرُ ﴾
That is because Allah, He is the Truth, and that which they invoke besides Him is falsehood; and that Allah, He is the Most High, the Most Great.
meaning, He is the Most High and there is none higher than Him, and He is the Most Great Who is greater than everything. Everything is subjugated and insignificant in comparison to Him.