From a sermon by Columbanus Hibernus, 543-615
But if the flesh is harrowed and the soul does not bear fruit, it is as if a field were continually ploughed and yet the crop never grew, or as if a man fashioned a statue of gold on the outside and of clay within. For what use is it if without the city walls war is being waged, while within it suffers ruin?' As if a man dug outside his vineyard and right on its boundary while leaving it, untilled within, to thorns and thistles! For of what use is the religion of the outward man, if there is not also shown an improvement in the inner? That person can be false and a thief, that person is false and a hypocrite, who displays one quality in his bearing and another in his character. Then let us not be like whited sepulchres, let us study to show ourselves splendid and adorned within and not without; for true religion resides in lowliness not of habit but of heart. For where else does the Lord dwell, save in the heart of the truly humble, according to that saying of Isaiah, “But on whom shall I look, or with whom shall I abide, save with the humble and peaceable and with him who fears my words?’’ (Isa. 66. 2)
Therefore whoever wishes to be made God's dwelling-place, should strive to make himself humble and peaceable, that he may be known to be God's servant, not by his greed for talk and pliability of manner, but by the reality of his lowliness; for goodness of heart requires no false unction of talk. Idle then is a religion decorated with prostrations of the body, equally idle is the mere mortification of the flesh and the hollow devotion of the outward man unless it is accompanied by a fruitful moderation of the mind. What use is it for the passions to be assailed by a servant, when they are found to be in league with the master? Then, lest perhaps we should labour without fruit, let us take pains to be freed from our vices by God's help, that thereafter we can be adorned with virtues. Thus let us cleanse ourselves as far as we are able from every taint of vices, from pride first, from ill-will, from anger, from blasphemy, from injustice, from spite, from melancholy, from vainglory, from covetousness, from malice, from all bitterness; that we may be possessed by lowliness, gentleness, kindness, courtesy, sobriety, mercy, justice, joy, and love.