Sandalwood gives more and more fragrance when it is subjected to more and more grindings. The sugarcane yields juice as it is chewed more and more. Gold gets refined when it is melted in the fire. So also a true devotee will not falter in his love for God even when he faces troubles and mistakes in his life. God tests his devotees only to take them to a higher level on the spiritual ladder.
(SSS Vol 26, Ch 138)