How do I make this levitation script make the brick stay in one place?

I'm trying to make a game, it has a brick you stand on, and it is supposed to levitate in one place. I can't just make that one part, it is supposed to stay in one XYZ and goes where-ever with the rotation. Help please.

for i=1, math.huge do
script.Parent.Velocity = Vector3.new(x,3.45,y)
wait(0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001)
end

Thank you!