Using a quote in an essay?

When writing an essay and including quotes, if the quote is, "I have given suck and know how tender 'tis to love the babe that milks me: i would, while it was smiling in my face, have plucked my nipple from his boneless gums and dashed the brains out, had i sworn as you have done to this." is it ok for my to write it as ,"....I would....dash the brains ('the babe that milks me') had i sworn as you have done to this." instead of writing out the whole thing, if i shouldn't, suggestions as to what i could would be appreciated. Thankyou