Time is the mercy of Eternity; without Time's swiftness/ Which is the swiftest of all things: all were eternal torment. - William Blake

Those who restrain desire do so because theirs is weak enough to be restrained.

Every night, and every morn,
Some to misery are born.
Every morn, and every night,
Some are born to sweet delight.
Some are born to sweet delight.
Some are born to endless night.

It is right it should be so;
Man was made for joy and woe;
And when this we rightly know,
Thro' the world we safely go.

Joy and woe are woven fine,
A clothing for the soul divine.
Under every grief and pine
Runs a joy with silken twine.