There is a well known story from the Talmud which tells how a heathen once came to Shammai and said, ‘I will become a proselyte on the condition that you teach me the entire Torah while I stand on one foot.’ Shammai chased him away with a builder’s measuring stick. When he appeared before Hillel with the same request, Hillel said, ‘Whatever is hateful to you, do not do to your neighbour. That is the entire Torah. The rest is commentary; go and learn it.’
"Mediation in Judaism —thoughts from a ba’al teshuvah,"
6, Article 4.
Available at: http://epublications.bond.edu.au/adr/vol4/iss6/4