Please give a traceable link to where Goenka-ji said this. This will help us understand exactly what he said, and the context he said it in.
Not sleeping on soft and luxurious beds is part of keeping the Eight Precepts, which many of us undertake monthly and on Retreats.
8. Uccasayana-mahasayana veramani sikkhapadam samadiyami
I undertake the precept to refrain from lying on a high or luxurious sleeping place.
(from Anguttara Nikaya 8.41)
---The trouble is that you think you have time---
---It's not what happens to you in life that is important ~ it's what you do with it ---