"La existencia sería intolerable si nunca soñáramos."

Simplified Meaning:

Life would be very hard and boring if we never had dreams or hopes. Imagine a person who works all day without ever thinking about things they want to do in the future, like traveling, starting a family, or starting a new hobby. This person would probably feel very sad and empty because they have nothing to look forward to. Dreams and goals give us reasons to wake up in the morning and try our best, even when things are tough. It's like having a small light in the dark that helps us find our way. For example, during tough times like the Great Depression, people held onto dreams of a better life and used those dreams to get through hard times. If someone feels stuck in a routine, they could start dreaming about a new adventure or a new skill they want to learn. This can give them the energy and motivation to change their life for the better.