Phases

 Leaves are a phase of trees,

Sadness is a phase of happy,

Day is a phase of night,

Bravery is a phase of fright,

Hate is a phase of love,

Pigeon is a phase of dove,

No is a phase of yes,

Horrible is a phase of the best,

Friday is a phase of the week,

Cold is a phase of heat,

But death is a phase of life.

But death will never be the end.