Some of Kierkegaard's key ideas include the concept of "subjective and objective truths", the knight of faith, the recollection and repetition dichotomy, angst, the infinite qualitative distinction, faith as a passion, and the three stages on life's way. Kierkegaard wrote in Danish and the reception of his work was initially limited to Scandinavia, but by the turn of the 20th century his writings were translated into French, German, and other major European languages. By the mid-20th century, his thought exerted a substantial influence on philosophy, theology, and Western culture.