Darkness and light cannot co-exist; Kama and Rama cannot be in the same place together; they are like fire and water. (GV, p. 245)

Pleasure and pain, good and bad co-exist,

None can separate them.

You cannot find pleasure or pain.

Good or bad to exclusion of the other.

Pleasure results when difficulties fructify. (Telugu Poem)

Thus, happiness and sorrow come to teach us equanimity.

(SSS Vol.34, p. 179)