Our Guru realised the truth of all the stuf you call love,Life,God and death.Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/hard-talk/5775-defination-of-patit-fallen-from-sikhhood.html
they were able to explain that to the world.
many people who were unable to understand them did not called them fool but mad.Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=5775
There is no fault of the one who realised the truth but for the one who lacks the depth of mind to understand the truth.
Das can recomend you to study Thre scriptures of Panth(Faith) and Akal willing you will realise what fool like das wants you to realise.
As per holy Bible being fool in God is better than being intelligent in world.