Constancy... that small change of love, which people exact so rigidly, receive in such counterfeit coin, and repay in baser metal.

As soon / Seek roses in December - ice in June; / Hope constancy in wind, or corn in chaff; / Believe a woman or an epitaph, / Or any other thing that's false, before / You trust in critics.

That household virtue, most uncommon, / Of constancy to a bad, ugly woman.

I have always argued that change becomes stressful and overwhelming only when you've lost any sense of the constancy of your life. You need firm ground to stand on. From there, you can deal with that change.

He marveled at the strange blindness by which men, though they are so alert to what changes in themselves, impose on their friends an image chosen for them once and for all. He was being judged by what he had been. Just as dogs don't change character, men are dogs to one another.

Since 'tis Nature's law to change, Constancy alone is strange