Pradyumna: "I am the original fragrance of the earth, and I am the heat in fire. I am the life of all that lives, and I am the penances of all ascetics."
Prabhupāda: So Kṛṣṇa is describing how He is spread everywhere, in details. In the beginning, before this verse, He has mentioned in so many ways. So we can see Kṛṣṇa in every step and every moment. If we practice to see Kṛṣṇa, it is not difficult. Whenever there is fragrance... Just like rose flower, beauty and fragrance, you can immediately remember Kṛṣṇa, "Here is Kṛṣṇa." Simply we have to practice it.
So as soon as you remember Kṛṣṇa or you say or utter the word "Kṛṣṇa," immediately Kṛṣṇa contacts you. You are in contact with Kṛṣṇa immediately. And if you remain constantly in contact with Kṛṣṇa by studying all these detail, then where is the lack of Kṛṣṇa consciousness? And if you remain always in that way, Kṛṣṇa conscious, then you are the topmost yogī. Yoginām api sarveṣām (BG 6.47). Very easy. It is not at all difficult. Simply you have to practice. As soon as there is nice fragrance, nice flower... In another place it is said that the nice flower, or any flower that is fructified, there is blooming, that is smiling, smiling of Kṛṣṇa. So you can see Kṛṣṇa smiling as soon as you see a flower.
So I do not know why they say, "Can you show me Kṛṣṇa?" Kṛṣṇa is showing Himself in so many ways; they will not take it. It is not at all difficult to see Kṛṣṇa every moment, in every step, if we study what Kṛṣṇa says: "I am," "This is." Puṇyo gandhaḥ pṛthivyāṁ ca (BG 7.9). Everything is there. Now, within the earth, the every stock is there. The flavor of rose flower is there, and the flavor of some other flower is also there, but you cannot take out by your so-called scientific chemical process. You take some lump of earth and extract from it the flavor of rose. It is there. That is a fact. Because you sow the seed of a rose flower, it will exact the rose flavor from the earth. That's a fact. Who can deny it? Otherwise, wherefrom the flavor is coming? Kṛṣṇa also, He, it is said, jīvanaṁ sarva-bhūteṣu. He's the life, seed. Bījo 'ham... Next, next verse He'll say, bījaṁ māṁ sarva-bhūtānām (BG 7.10). Bīja, the seed. The seed is so nicely made by Kṛṣṇa's brain that as soon as you put on the seed within the earth and put some water, it will come out, fructify, and gradually grow and exact the flavor, the color, everything. This is a fact. No, everybody knows. Not only that: a small seed of banyan tree—bījaṁ māṁ sarva-bhūtānām—there is also Kṛṣṇa. Otherwise how this wonderful thing can happen, a small seed just like a mustard seed, and it...? Not only one tree, but many millions of fruits, and in each fruit, many millions of trees. This is Kṛṣṇa's brain. You cannot do that. The so-called manufacturer, they can manufacture one watch, very complicated, but not that from that watch many watches will come. No, that is not possible.
But Kṛṣṇa is so powerful, omnipotent, that He has manufactured... Because He is there. Bījaṁ māṁ sarva-bhūtānām (BG 7.10). Whenever He is there, He can play wonderful things. This is the study of Kṛṣṇa consciousness. Where is the difficulty? Bīja... Puṇyo gandhaḥ pṛthivyāṁ ca tejaś ca, tejaś cāsmi vibhāvasau (BG 7.9). Now, this electric lamp, it is brilliant, or it has got some heat, temperature. Wherefrom it is coming? It is coming from Kṛṣṇa. That's a fact. Cause of all causes.
(Srila Prabhupada Lecture, Vrindavan, August 15, 1974)