• Let no man in the world live in delusion. Without a Guru none can cross over to the other shore.
• Whoever, styling himself as a teacher lives on the charity of others, never bow before him. He who earns his livelihood by the sweat of Hasbro and shares it with others. O Nanak only he can know the way.
• The word is the Guru, The Guru is the Word, For all nectar is enshrined in the world Blessed is the word which reveal the Lord’s name But more is the one who knows by the Guru’s grace
• God is one, but he has innumerable forms. He is the creator of all and He himself takes the human form.
• The lord can never be established nor created; the formless one is limitlessly complete in Himself.
• One cannot comprehend Him through reason, even if one reasoned for ages.
• The word is the Guru, The Guru is the Word, For all nectar is enshrined in the world Blessed is the word which reveal the Lord’s name But more is the one who knows by the Guru’s grace.
• He who shows the real home in this body is the Guru. He makes the five sounded word reverberate in man.
• Even Kings and emperors with heaps of wealth and vast dominion cannot compare with an ant filled with the love of God.
• As fragrance abides in the flower
  As reflection is within the mirror,
  So does your Lord abide within you,
  Why search for him without?

Sources: http://www.thecolorsofindia.com/nanak/quotes.html