Thomas Chalmers tells us how hard it is for man to give up the things in the world he loves:
To estimate the magnitude and the difficulty of such a surrender, let us only think that it were just as arduous to prevail on him not to love wealth, which is but one of the things in the world, as to prevail on him to set wilful fire to his own property. This he might do with sore and painful reluctance, if he saw that the salvation of his life hung upon it. But this he would do willingly, if he saw that a new property of tenfold value was instantly to emerge from the wreck of the old one.
– Thomas Chalmers, "The Expulsive Power of a New Affection""The kingdom of heaven is like treasure hidden in a field, which a man found and covered up. Then in his joy he goes and sells all that he has and buys that field." Matthew 13:44