A form of the possessive case of the pronoun thou, now superseded in common discourse by your, the possessive of you, but maintaining a place in solemn discourse, in poetry, and in the usual language of the Friends, or Quakers.
Prayer is a privilege and the soul's sincere desire. We can move beyond routine and 'checklist' prayers and engage in meaningful prayer as we appropriately ask in faith and act, as we patiently persevere through the trial of our faith, and as we humbly acknowledge and accept 'not my will, but Thine, be done.' David A. Bednar
To thine own self be true, and it must follow, as the night the day, thou canst not then be false to any man. William Shakespeare
Be still and cool in thine own mind and spirit. George Fox
Be thine own palace, or the world's thy jail. John Donne