The Secret of Sargun-Nirgun
These two words are mentioned in Gurbani and hold special secret. The created world is called Sargun, meaning it has attributes, has activity, has form as well as non-physical aspects. The Sargun world is a world of experience and has duality. In it we see polarity meaning comparative opposites like hot-cold, long-short, soft-hard, peace-anger etc.
The Nirgun means nothing of that which is Sargun is there in it. Nirgun is thus has formless presence of the Creator. The duality also has two parts- one that is true and and is called Naam in Gurbani. It is eternal, is all aware, has all presence and is self expressed in creation activity.
In Gurbani both are talked of together. Without Nirgun the Sargun has no existence. Everything happening in Sargun world is in awareness of Nirgun presence. Everything in Sargun is created by Nirgun.
ਸਰਗੁਨ ਨਿਰਗੁਨ ਨਿਰੰਕਾਰ ਸੁੰਨ ਸਮਾਧੀ ਆਪਿ ॥
Sargun Nirgun Nirankar Sunn Samadhi Aap.
Sargun, Nirgun are Nirankar (formless One), who Himself is in Sunn Samadhi.