Even though there isn't much crowd on God's path, those who walk it find it very difficult.

This couplet beautifully points out a paradox. It observes that while the path towards God or righteousness is often not crowded, those who choose to walk it find it exceedingly difficult. It's not the external hustle and bustle or competition that makes the spiritual journey tough. Instead, the real challenges lie within. It's about overcoming personal struggles, temptations, and maintaining faith and discipline. The path is open, but the walk requires immense inner strength and perseverance, making it a demanding journey for the individual, despite the apparent lack of external obstacles or fellow travelers.