The Supreme Personality of Godhead is already in the core of everyone's heart. Īśvaraḥ sarva-bhūtānāṁ hṛd-deśe 'rjuna tiṣṭhati (BG 18.61). Logically, therefore, it was not at all difficult for Lord Viṣṇu to enter Hiraṇyakaśipu's body. The word vivigna-cetāḥ, "very anxious," is significant. It is not that Lord Viṣṇu was afraid of Hiraṇyakaśipu; rather, because of compassion, Lord Viṣṇu was in anxiety about how to act for his welfare.
In a subtle body inconceivable to Hiranyakasipu, Lord Visnu, who was in great anxiety, entered Hiranyakasipu's nostril along with his breath
Expressions researched:
"In a subtle body inconceivable to Hiranyakasipu, Lord Visnu, who was in great anxiety, entered Hiranyakasipu's nostril along with his breath"
Srimad-Bhagavatam
SB Canto 8
In a subtle body inconceivable to Hiranyakasipu, Lord Visnu, who was in great anxiety, entered Hiranyakasipu's nostril along with his breath.
Lord Vāmanadeva continued: O King of the demons, after Lord Viṣṇu made this decision, He entered the body of His enemy Hiraṇyakaśipu, who was running after Him with great force. In a subtle body inconceivable to Hiraṇyakaśipu, Lord Viṣṇu, who was in great anxiety, entered Hiraṇyakaśipu's nostril along with his breath.