"全部行かないなら、なぜ行くのか"

Simplified Meaning:

Imagine you're planning to run a marathon. Completing the entire race requires a lot of effort, training, and dedication. If you decide to sign up but only intend to run half the distance and then quit, it can feel like a waste of time and energy. The same idea applies to many aspects of life. For instance, if you take up a new hobby like learning to play the guitar but don't practice regularly or focus on improving, you won't get far and might end up feeling frustrated. In your job, committing fully means putting in the effort to do your best work. Half-hearted efforts can lead to poor results and missed opportunities for personal growth or career advancement. When starting a task or chasing a dream, giving it your all increases the chances of success and satisfaction. So, whatever you choose to do, dedicate yourself fully to it for the best outcomes, rather than just going through the motions.