This is the Second Stanza of Kirtan Soheila by Guru Nanak
There are six systems and six teachers and six are their different teachings,
but the teacher of all is the one Lord who meets a man in so many forms.
One should practice those teachings where his praises are in someway
sung, then one will gain honor.
There is but one sun which runs thru the seconds, minutes and hours, the solar and lunar days the changing seasons of the year.
There is but one God who gives life to everyone.