Om Bhur Bhuvah Svah
Tat Savitur varenyam bhargo devasya dhimahi
Dhiyo yo nah prachodayat
Om


You who are the source of all power,
Whose rays illuminate the world,
Illuminate also my heart
So that it too can do Your work

I first heard this chant when I took a Sanskrit workshop with Vyas Houston.  I spent hours singing along with his audio tape until I could chant it by myself.