“Happiness consists of two kinds; physical and spiritual. The physical happiness is limited; its utmost duration is one day, one month, one year. It hath no result. Spiritual happiness is eternal and unfathomable. This kind of happiness appeareth in one’s soul with the love of God and suffereth one to attain to the virtues and perfections of the world of humanity. Therefore, endeavor as much as thou art able in order to illumine the lamp of thy heart by the light of love.”

‘Abdu’l-Bahá