Brief Quranic Verse Tafsir
This verse emphasizes the need for Muslims to adhere to the tenets of modesty and to control their eyes and other body parts from illegal sexual encounters. This is purer for their souls and can lead to purer lives for themselves and for all those around them.
Tell the believing men to lower their gaze (from looking at forbidden things), and protect their private parts (from illegal sexual acts). That is purer for them. Verily, Allah is All-Aware of what they do.
Quran (Surah Al-Noor, Verse 30)