Sarvan, Manan, Nidhyasan - Sarbloh Granth
ਨਾਮ ਰੂਪ ਆਯੁਧ ਪ੍ਰਭੁ ਪਾਰਿਖਦ ਚਤੁਰ ਸੁ ਬਿਗ੍ਰਹੁ ਰੂਪ ਬਰੇ ॥
The wise ones know that the Lord is the weapon in the form of Naam, with which to be released from the inner fight
ਦਰਸਨ ਪਰਸਨ ਧਾਰਨ ਸ੍ਰਵਨ ਮਨ ਨਿਧਯਾਸਨ ਕਰਤ ਤਰੇ ॥
Seeing, touching, holding through the practice of sravan [hearing knowledge], manan [contemplating knowledge] and nidhyasan [implementing knowledge], one is able to cross over
Sri Sarbloh Granth, verse 3167
ਸ੍ਰੀ ਸਰਬਲੋਹ ਗ੍ਰੰਥ, ੩੧੬੭
[Taken from Vivek Pradipka pg.38, written by Tirath Singh Nirmala].
Vivek Pradipka, written by Tirath Singh Nirmala, is a translation and commentary of a Sevapanthi text, Bibeksar, written by Bhai Adhan Shah Ji in the 1700s. Describing and explaining deep Gurmat Sidhant, this book is a gold mine for anyone interested in learning about Gurmat Sidhant from a traditional Sikh Sampradyaik [order] perspective.
Also available is a translation and commentary of Bhavrasamrit, written by Pandit Gulab Singh Jj, a very famous Nirmala from the 1700s.