Because the great saintly persons are compassionate toward all conditioned souls, the boat is still lying on this side. In other words, one can meditate upon the lotus feet of the Lord at any time, and by so doing one can cross over the great ocean of material existence.
Meditation means concentration upon the lotus feet of the Lord. Lotus feet indicate the Supreme Personality of Godhead. But those who are impersonalists do not recognize the lotus feet of the Lord, and therefore their object of meditation is something impersonal. The demigods express their mature verdict that persons who are interested in meditating on something void or impersonal cannot cross over the ocean of nescience.