Allah says:

[وَلَهُ مَن فِى السَّمَـوَتِ وَالاٌّرْضِ وَمَنْ عِنْدَهُ]

(To Him belongs whosoever is in the heavens and on earth. And those who are near Him) i.e., the angels,

[لاَ يَسْتَكْبِرُونَ عَنْ عِبَادَتِهِ]

(are not too proud to worship Him,) they do not feel proud and do not refuse to worship Him. This is like the Ayah:

[لَّن يَسْتَنكِفَ الْمَسِيحُ أَن يَكُونَ عَبْداً للَّهِ وَلاَ الْمَلَـئِكَةُ الْمُقَرَّبُونَ وَمَن يَسْتَنْكِفْ عَنْ عِبَادَتِهِ وَيَسْتَكْبِرْ فَسَيَحْشُرُهُمْ إِلَيهِ جَمِيعاً ]

(Al-Masih will never be proud to reject being a servant of Allah, nor the angels who are the near. And whosoever rejects His worship and is proud, then He will gather them all together unto Himself.) [4:172]

[وَلاَ يَسْتَحْسِرُونَ]

(nor are they weary.) means, they do not get tired or feel bored.

[يُسَبِّحُونَ الْلَّيْلَ وَالنَّهَارَ لاَ يَفْتُرُونَ ]

(They glorify His praises night and day, they never slacken.) They persist in their worship night and day, obeying Allah to the utmost, and they are able to do this, as Allah says:

[لاَّ يَعْصُونَ اللَّهَ مَآ أَمَرَهُمْ وَيَفْعَلُونَ مَا يُؤْمَرُونَ]

(who do not disobey Allah in what He commands them, but do what they are commanded) [66:6]

[أَمِ اتَّخَذُواْ آلِهَةً مِّنَ الاٌّرْضِ هُمْ يُنشِرُونَ - لَوْ كَانَ فِيهِمَآ آلِهَةٌ إِلاَّ اللَّهُ لَفَسَدَتَا فَسُبْحَـنَ اللَّهِ رَبِّ الْعَرْشِ عَمَّا يَصِفُونَ - لاَ يُسْأَلُ عَمَّا يَفْعَلُ وَهُمْ يُسْـَلُونَ ]

(21. Or have they taken (for worship) gods from the earth who raise the dead) (22. Had there been therein (in the heavens and the earth) gods besides Allah, then verily, both would have been ruined. Glorified be Allah, the Lord of the Throne, (High is He) above all that (evil) they associate with Him!) (23. He cannot be questioned as to what He does, while they will be questioned.)