Lightning and thunder need time, the light of the stars needs time, deeds need time, even after they are done, to be seen and heard.

[Blitz und Donner brauchen Zeit, das Licht der Gestirne braucht Zeit, Thaten brauchen Zeit, auch nachdem sie gethan sind, um gesehen und gehört zu werden.]

Friedrich Nietzsche (1844-1900) German philosopher and poet

The Gay Science [Die fröhliche Wissenschaft], Book 3, § 125 (1882) [tr. Common (1911)]
    (Source)

On the death (murder) of God.

The book is also known as La Gaya Scienza, The Joyful Wisdom, or The Joyous Science.

(Source (German)). Alternate translations:

Lightning and thunder require time; the light of the stars requires time; deeds, though done, still require time to be seen and heard.
[tr. Kaufmann (1974)]

Lightning and thunder need time; the light of the stars needs time; deeds need time, even after they are done, in order to be seen and heard.
[tr. Nauckhoff (2001)]

Even after they are over and done with, thunder and lightning take time, the light of the stars takes time, and deeds too take time, before they can be seen and heard.
[tr. Hill (2018)]