SB 10.80.4
siras tu tasyobhaya-lingam anamet
tad eva yat pasyati tad dhi caksuh
angani visnor atha taj-jananam
padodakam yani bhajanti nityam
Translation:
An actual head is one that bows down to the Lord in His manifestations among the moving and nonmoving creatures, real eyes are those that see only the Lord, and actual limbs are those which regularly honor the water that has bathed the Lord’s feet or those of His devotees.