May 8

…to those souls who are firm and steadfast, tests are the greatest favours.  Consider thou that at the time of an examination in sciences and arts, the dull and lazy pupil finds himself in calamity. But to the intelligent and sagacious student examination in learning produces honor and infinite happiness. Alloyed gold, subjected to the fire, portrays its baseness, while the intensity of the flame enhances the beauty of pure gold. Therefore, tests to the weak souls are calamity and to the veiled ones the cause of their disgrace and humiliation. The point is this, that in the path of Truth every difficulty is made plain and every trial is the matchless bounty. Therefore, the believers of God and the maid-servants of the Merciful must not relax during trial and no disaster must deter their service in the Cause of God. ... 
- ‘Abdu’l-Baha  (From a Tablet; Star of the West, vol. 2, no. 15, December 12, 1911)