And what is true of health is true of other things. It is only when some calamity breaks the calm tenor of our ways and deprives us of some gift of fortune we have long enjoyed that we feel how great was the value of what we have lost. There are times in the lives of most of us when we would have given all the world to be as we were but yesterday, though that yesterday had passed over us unappreciated and unenjoyed. Sometimes, indeed, our perception of this contrast brings with it a lasting and salutary result. In the medicine of Nature a chronic and abiding disquietude or morbidness of temperament is often cured by some keen though more transient sorrow which violently changes the current of our thoughts and imaginations. The difference between knowledge and realisation is one of the facts of our nature that are most worthy of our attention. Every human mind contains great masses of inert, passive, undisputed knowledge which exercise no real influence on thought or character till something occurs which touches our imagination and quickens this knowledge into activity. Very few things contribute so much to the happiness of life as a constant realisation of the blessings we enjoy. The difference between a naturally contented and a naturally discontented nature is one of the marked differences of innate temperament, but we can do much to cultivate that habit of dwelling on the benefits of our lot which converts acquiescence into a more positive enjoyment. Religion in this field does much, for it inculcates thanksgiving as well as prayer, gratitude for the present and the past as well as hope for the future. Among secular influences, contrast and comparison have the greatest value. Some minds are always looking on the fortunes that are above them and comparing their own penury with the opulence of others. A wise nature will take an opposite course and will cultivate the habit of looking rather at the round of the ladder of fortune which is below our own and realising the countless points in which our lot is better than that of others. As Dr. Johnson says, 'Few are placed in a situation so gloomy and distressful as not to see every day beings yet more forlorn and miserable from whom they may learn to rejoice in their own lot.'