"His disciples say unto him, If the case of the man be so with his wife, it is not good to marry. (11) But he said unto them, All men cannot receive this saying, save they to whom it is given. (12) For there are some eunuchs, which were so born from their mother's womb: and there are some eunuchs, which were made eunuchs of men: and there be eunuchs, which have made themselves eunuchs for the kingdom of heaven's sake. He that is able to receive it, let him receive it."
How little do these men form proper conceptions in what the kingdom of heaven in grace is made, who have fancied the qualifications for the enjoyment of it consists in things outward; instead of that regeneration of the heart, which the Lord himself describes, as the best and only qualification, by the blood and righteoussness of Jesus Christ. Men may make themselves what they may in nature, but it is the Lord who alone makes a new heart in grace. John 3:8; Ezekiel 36:24-32.