Some timeless masterpieces:
 
By Fr. Jean Croiset (spiritual director and confessor of St. Margaret Mary Alacoque):

Croiset 1

Bishop Massillon:

Croiset 2

St. Leonard:

The Little Number of Those are Saved

Blessed Newman:

Many Called, Few Chosen

St. Montfort:

Letter to the Friends of the Cross

From the latter:

My dear brothers and sisters, there are two companies that appear before you each day: the followers of Christ and the followers of the world.

Our dear Saviour's company is on the right, climbing up a narrow road, made all the narrower by the
world's immorality. Our Master leads the way, barefooted, crowned with thorns, covered with blood, and laden with a heavy cross. Those who follow him, though most valiant, are only a handful, either because his quiet voice is not heard amid the tumult of the world, or because people lack the courage to follow him in his poverty, sufferings, humiliations and other crosses which his servants must carry all the days of their life....Their number is so small that we would be dumbfounded if we knew it. It is so small that there is scarcely one in ten thousand, as has been revealed to several saints, including St. Simon Stylites (as is related by Abbot Nilus), St. Basil, St. Ephrem and others. It is so small that, should it please God to gather them together, he would have to call them one by one as he did of old through his prophet, 'You will be gathered one by one;' one from this country, one from that province.

On the left hand is the company of the world or of the devil. This is far more numerous, more imposing and more illustrious, at least in appearance. Most of the fashionable people run to join it, all crowded together, although the road is wide and is continually being made wider than ever by the crowds that pour along it like a torrent. It is strewn with flowers, bordered with all kinds of amusements and attractions, and paved with gold and silver.