From This Week’s Torah Portion:
“And now, Yisra’el, what is YHWH your Elohim asking of you, but to fear YHWH your Elohim, to walk in all His ways and to love Him, and to serve YHWH your Elohim with all your heart and with all your soul, to guard the commands of YHWH and His laws which I command you today for your benefit?”
(In other words, everything. But it's absolutely worth the price.)