Once when Kṛṣṇa and His cowherd friends were enjoying friendly conversation, Kṛṣṇa began to address His associates in casual language. At that time Kṛṣṇa's servant, Patrī, was also enjoying the conversation. But then, remembering his position of servitude, Patrī bowed down before his master, and with great respect and control, he stifled his smiling. This subdued smiling is an instance of concealment caused by a respectful attitude.
Remembering
There are many symptoms of ecstatic love caused by remembering Kṛṣṇa. For example, one friend of Kṛṣṇa informed Him, "My dear Mukunda, just after observing a bluish cloud in the sky, the lotus-eyed Rādhārāṇī immediately began to remember You. And simply by observing this cloud She became lusty for Your association." This is an instance of remembering Kṛṣṇa in ecstatic love because of seeing something resembling Him. Kṛṣṇa's bodily complexion is very similar to the bluish hue of a cloud, so simply by observing a bluish cloud, Śrīmatī Rādhārāṇī remembered Him.
One devotee said that even when he was not very attentive he would sometimes, seemingly out of madness, remember the lotus feet of Kṛṣṇa within his heart. This is an instance of remembrance resulting from constant practice. In other words, devotees who are constantly thinking of the lotus feet of Kṛṣṇa, even if they are momentarily inattentive, will see the figure of Lord Kṛṣṇa appearing within their hearts.