This is an excerpt from a letter written by Swamiji to Deewan Sahibji in May 1893.
Often and often, we see that the very best of men even are troubled and visited with tribulations in this world; it may be inexplicable; but it is also the experience of my life that the heart and core of everything here is good, that whatever may be the surface waves, deep down and underlying everything, there is an infinite basis of goodness and love; and so long as we do not reach that basis, we are troubled; but having once reached that zone of calmness, let winds howl and tempests rage. The house which is built on a rock of ages cannot shake.