Two things whose worth is only known to one who has lost them

Hawzah News Agency - Imam Ali, peace be upon him, says:

«شَيْئَانِ لاَ يَعْرِفُ فَضْلَهُمَا إِلاَّ مَنْ فَقَدَهُمَا اَلشَّبَابُ وَ اَلْعَافِيَةُ.»

'There are two things whose worth is only known to one who has lost them: youth and health.'

Ghurar al-Hikam, v. 1, p. 414