Existentialism is a term applied to the work of a number of 19th- and 20th-century philosophers who, despite profound doctrinal differences, generally held that the focus of philosophical thought should be to deal with the conditions of existence of the individual person and his or her emotions, actions, responsibilities, and thoughts. The early 19th-century philosopher Soren Kierkegaard, posthumously regarded as the father of existentialism, maintained that the individual is solely responsible for giving one’s own life meaning and living that life passionately and sincerely, in spite of many existential obstacles and distractions including despair, angst, absurdity, alienation, and boredom. Subsequent existential philosophers retain the emphasis on the individual, but differ in varying degrees on how one achieves and what constitutes a fulfilling life, what obstacles must be overcome, and what external and internal factors are involved, including the potential consequences of the existence or non-existence of God.