When Rasulullah reached the age of thirty-three, he developed a tendency to be alone and in deep thought and was drawn more towards the contemplation of the Great Creator, Allah. There was an ever-present light and brilliance 'Noor' around him which gladdened his heart.
Rasulullah resented the worship of idols and he denounced 'polytheism' (worship of more than one God). He abstained from eating food that had been offerings to the idols.
As Rasulullah got older he desired to be lonely and began to retire to the cave of Hira which was about five kilometers from Makkah. The cave was only three meters by two meters in size. During his visits to the cave he took with him only a small supply of bread and water.
He was always engaged in prayer and contemplation of the Greatness of Allah, the One and Only God.
Contents of the biography of the Prophet Muhammed