Dear sir,
I have gone thru. the above post. How can one develop devotion with out fear? God is all love. He has given us that we need to be with HIM and that is the aim of Life as well. If we cannot be with HIm we will be below the expected level of purity and spirituality. Hence we should have HIS blessings and Grace to be out of this rut of Incarnations.If we could not achieve it, we have wasted this life. We get devoted to HIm for seeking HIS blessings so that we attain the level of purity. The fact that we may or we may not get that level should bring in enough fear in me that I try to follow my Gurus and do all that is expected Of a Sikh [Nitnem and practising all that is prescribed ].I think we mortals have enough cause to be afraid of HIM that we may fail in the examination of life. It is this way that I have developed the concept.
Regarding your observation that Guru sahibs have not said so, the entire thread is full of quotes from SGGS ji.Still if you need you may go thru. the 'tuks' as provided.
Naam jap, simran,meditation, Going to Gurudwara and listening to HIS praises are to develop Love for HIM.

Regards.
E&OE