Life is made of so many partings welded together - Charles Dickens

It was the best of times, it was the worst of times, it was the age of wisdom, it was the age of foolishness, it was the epoch of belief, it was the epoch of incredulity, it was the season of Light, it was the season of Darkness, it was the spring of hope, it was the winter of despair, we had everything before us, we had nothing before us, we were all going direct to heaven, we were all going direct the other way - in short, the period was so far like the present period, that some of its noisiest authorities insisted on its being received, for good or for evil, in the superlative degree of comparison only.

I begin to think,' said Estella, in a musing way, after another moment of calm wonder, 'that I almost understand how this comes about. If you had brought up your adopted daughter wholly in the dark confinement of these rooms, and had never let her know that there was such a thing as the daylight by which she has never once seen your face — if you had done that, and then, for a purpose, had wanted her to understand the daylight and know all about it, you would have been disappointed and angry? . . .'
Or,' said Estella, ' — which is a nearer case — if you had taught her, from the dawn of her intelligence, with your utmost energy and might, that there was such a thing as daylight, but that it was made to be her enemy and destroyer, and she must always turn against it, for it had blighted you and would else blight her — if you had done this, and then, for a purpose, had wanted her to take naturally to the daylight and she could not do it, you would have been disappointed and angry? . . .'
So,' said Estella, 'I must be taken as I have been made. The success is not mine, the failure is not mine, but the two together make me.

So, throughout life, our worst weaknesses and meannesses are usually committed for the sake of the people whom we most despise.