God said “
∇
⋅
E
⃗
=
ρ
ε
0
∇
×
E
⃗
=
-
∂
B
⃗
∂
t
∇
⋅
B
⃗
=
0
∇
×
B
⃗
=
μ
0
J
⃗
+
μ
0
ε
0
∂
E
⃗
∂
t
” and there was light.