Lord Nagarjuna

Dear Dharma friends,
Where to cite this quote: Nāgārjuna in another place said that the seeker of the truth is told that ‘everything exists.’ Later he is told that ‘everything doesn’t exist.’ When his intellect is more matured he is told ‘everything both exists and does not exist.’ Finally he is told that ‘everything neither exists nor does not exist.’
Thanks for your support