Which of the following are beliefs of Buddhism?
I. The world is full of sorrows.
II. People suffer on account of desires.
III. If desires are conquered, nirvana will be attained.
IV. The existence of God and Soul must be recognised.

Buddhist philosophy refers to the philosophical investigations and systems of inquiry that developed among various Buddhist schools in India following the death of the Buddha and later spread throughout Asia. The Buddhist path combines both philosophical reasoning and meditation. The four Noble Truths of Buddhism are the world is full of sorrows, Desire is root cause of sorrow, If desire is conquered all sorrows can be removed, Desire can be removed by following the eight-fold path.