ولي خط وللأيام خط

و بينهما مخالفة المداد

فاكتبه سواد في بياض

و تكتبه بياض في سواد

I have a pen and Time has a pen

The only difference between them is the ink

I write with black (ink) on white (paper)

and Time writes with white (ink) on black (hair)