Allah Most High says,  

وَقَضَىٰ رَبُّكَ أَلَّا تَعْبُدُوا إِلَّا إِيَّاهُ وَبِالْوَالِدَيْنِ إِحْسَانًا ۚ إِمَّا يَبْلُغَنَّ عِندَكَ الْكِبَرَ أَحَدُهُمَا أَوْ كِلَاهُمَا فَلَا تَقُل لَّهُمَا أُفٍّ وَلَا تَنْهَرْهُمَا وَقُل لَّهُمَا قَوْلًا كَرِيمًا

And your Lord has decreed that you not worship except Him, and to parents, good treatment. Whether one or both of them reach old age [while] with you, say not to them [so much as], “uff,” and do not repel them but speak to them a noble word. (Surah Al-Isra 17:23) 

Allah reminds us that worshipping Him and honoring our parents go hand in hand. Showing love, respect, and patience toward our parents is one of the best ways to thank Allah for the blessing of having them. Even a small act of kindness, like speaking gently or caring for them in old age is counted as gratitude to Allah. When we honor our parents, we are really showing thanks to the One who gave them to us.