... The very constancy of my devotion should afford you this... 
Rafael Sabatini 「Scaramouche」
...But it was borne with a cheerful constancy...
William Still 「The Underground Railroad」
..., "I know you, alas, so little"; or again, "Show constancy in your love for me," etc...
Henny Kindermann Agnes Blake 「Lola」
...He could head the game that his master was pursuing and turn it back; and he would guard any object he was desired to “watch” with unflinching constancy...
R.M. Ballantyne 「The Dog Crusoe and his Master」
...The internal or“centripetal” force, the type or “impulse tospecification,” seeks to maintain the constancy of the specific forms inthe succession of generations: this is heredity...
Ernst Haeckel 「The Evolution of Man」
...All lovers havesworn by its constancy, and only part of them have kept their oaths...
Henry Warren 「Recreations in Astronomy」
...Their conduct when thus opposed, the constancy with which they endured pain, and the alacrity with which they accepted a summons to the fight, are surely proofs of their not wanting courage...
David Collins 「An Account of the English Colony in New South Wales, Vol. 1」
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