This hadith speaks about the value and importance of serving and worshipping God. It tells us that spending even a single day guarding the frontier for God's cause is more valuable than all worldly possessions combined. Similarly, spending an afternoon or morning worshipping God is also more valuable than all worldly possessions combined. Even something as small as occupying space with one's whip while serving God has greater value than all worldly possessions combined. This hadith teaches us that we should prioritize our service to God over any materialistic gains or desires we may have from this world because it will bring us closer to Him and ultimately lead us to paradise where we will be rewarded infinitely more for our efforts here on earth.