Srimad Bhagavatam Canto 10, Chapter 02, Text 38

SB 10.2.38

distya hare ’sya bhavatah pado bhuvo
 bharo ’panitas tava janmanesituh
distyankitam tvat-padakaih susobhanair
 draksyama gam dyam ca tavanukampitam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
O Lord, we are fortunate because the heavy burden of the demons upon this earth is immediately removed by Your appearance. Indeed, we are certainly fortunate, for we shall be able to see upon this earth and in the heavenly planets the marks of lotus, conchshell, club and disc that adorn Your lotus feet.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
The soles of the Lord’s lotus feet are marked with sankha-cakra-gada-padma conchshell, disc, club and lotus and also by a flag and a thunderbolt. When Krsna walks on this earth or in the heavenly planets, these marks are visible wherever He goes. Vrndavana-dhama is a transcendental place because of Krsna’s walking on this land frequently. The inhabitants of Vrndavana were fortunate to see these marks here and there. When Akrura went to Vrndavana to take Krsna and Balarama away to the festival arranged by Kamsa, upon seeing the marks of the Lord’s lotus feet on the ground of Vrndavana, he fell down and began to groan. These marks are visible to devotees who receive the causeless mercy of the Supreme Personality of Godhead (tavanukampitam). The demigods were jubilant not only because the appearance of the Supreme Lord would do away with the burdensome demons, but also because they would be able to see upon the ground the transcendental marks from the soles of the Lord’s lotus feet. The gopis always thought of the Lord’s lotus feet when He was walking in the pasturing grounds, and, as described in the previous verse, simply by thinking of the Lord’s lotus feet, the gopis were fully absorbed in transcendence (avista-ceta na bhavaya kalpate). Like the gopis, one who is always absorbed in thought of the Lord is beyond the material platform and will not remain in this material world. It is our duty, therefore, always to hear, chant and think about the Lord’s lotus feet, as actually done by Vaisnavas who have decided to live in Vrndavana always and think of the Lord’s lotus feet twenty-four hours a day.