Did Einstein Say Light is Massive?

[Haipule]

I’ve been laboring under the impression that photons are massless. But I’m now reading Einstein’s Universe by Nigel Calder in which he claims that Einstein said light is heavy
In some ways, it does seem that light must have mass. How could gravity bend light or trap light in a black hole if it had no mass? At the same time light doesn’t have the second property of matter. It doesn’t take up space. It wouldn’t be able to pass through solid objects such as glass, plastic. Or ice if it took up space. Only in intense concentration (laser) does light appear to take up space and  move material objects out of its way.

So, are we making a difference between mass and matter? Between photons and light?

Light is propagation of energy in a medium whether seen or unseen. Whether aether or glass. An electromagnetic waveform, with rarefactions and compressions, up down left right, not a particle. With a rate of induction not a speed. The medium exists but light does not. The unseen medium is usually called "Dark Energy" or aether and it's everywhere. E = MC2 is stupid!