Depression, anxiety and pessimism damage the channels of blessing from Above.

The Zohar explains that there is a lower world—our world—and there is a higher world. Our world is meant to continuously receive from that higher world, but always according to our personal state of mind.

If we are glowing with joy and vitality, then that world shines upon us in its full glory.

But if it we wallow in depression and anxiety, then we can receive only the metered trickle that squeezes through a constricted channel.

That is why King David said, “Serve G‑d with joy!” Because your joy here draws upon you another joy from above.