Abdu'l-Bahá said this quote

Men who suffer not, attain no perfection. The plant most pruned by the gardeners is that one which, when the summer comes, will have the most beautiful blossoms and the most abundant fruit. The laborer cuts up the earth with his plough, and from that earth comes the rich and plentiful harvest. The more a man is chastened, the greater is the harvest of spiritual virtues shown forth by him.

~ Abdu'l-Bahá

A man may be absolutely poor and dispossessed of everything, and yet be wordly. Another man may be very wealthy and yet severed. Severance means that one's heart must not be attached to the things of this world. It does not mean that a man must dispossess himself of them, or that he must not work and earn or practice his profession, whatever it may be, in the world. It does not mean that he must not put on what he has. If he has a silk garb, let him wear that; and if he has not, but has a suit of cotton goods, let him wear that clean. He must feel the same in both.

~ Abdu'l-Bahá

My hope is that the white and the black will be united in perfect love and fellowship, with complete unity and brotherhood. Associate with each other, think of each other, and be like a rose garden. Anyone who goes into a rose garden will see various roses, white, pink, yellow, red, all growing together and replete with adornment. Each one accentuates the beauty of the other. Were all of one color, the garden would be monotonous to the eye. If they were all white or yellow or red, the garden would lack variety and attractiveness; but when the colors are varied, white, pink, yellow, red, there will be the greatest beauty.

~ Abdu'l-Bahá