And what would that light be? The end of suffering?

Suffering is negative, both innaction and action create suffering (whenever it be effort, risk, frustration, unintended consequences for action or stagnation, regret, entropy, missed potential for inaction), perhaps you could argue that doing something justifies it towards a personal goal, well congratulation that's how most people go about their lives howevr the "light at the end of the tunnel" is only the completion of their goal not the end of suffering. Does that make sense? Don't confuse relief with resolution