Oscillates

Human life is like a pendulum that oscillates incessantly between boredom and pain, with fleeting and above all illusory intervals of pleasure and joy.

My mind about spirituality oscillates between Syncretism and Lojbanism. My Syncretism deals with Animisms as Daoism, Shintō, Native-world Animism, and so forth, as well as Buddhism and Hinduism, but I do not discount Xtian-type ideas from Jehovah's Witnesses, Gnosticism, and my birth religion, Roman Catholicism. My Lojbanism entails the study of Lojban and the practice in expressing spirituality in it, either by writing or making soliloquies.

He said the Earth's orbit around the sun oscillates between elliptical and more circular.