21. True it is that in these sufferings there is something bitter, and that strength of mind cannot hide this pain. I should not deny that the sea is deep because inshore it is shallow, nor that the sky is clear because sometimes it is covered with clouds, nor that the earth is fruitful because in some places there is but barren ground, nor that the crops are rich and full because they sometimes have wild oats mingled with them. So, too, count it as true that the harvest of a happy conscience may be mingled with some bitter feelings of grief. In the sheaves of the whole of a blessed life, if by chance any misfortune or bitterness has crept in, is it not as though the wild oats were hidden, or as though the bitterness of the tares was concealed by the sweet scent of the corn? But let us now proceed again with our subject.