You might just as well take the sun out of the sky as friendship from life; for the immortal gods have given us nothing better or more delightful.

[Solem enim e mundo tollere videntur ei, qui amicitiam e vita tollunt, qua nihil a dis immortalibus melius habemus, nihil iucundius.]

Marcus Tullius Cicero (106-43 BC) Roman orator, statesman, philosopher

Laelius De Amicitia [Laelius on Friendship], ch. 13 / sec. 47 (44 BC) [tr. Shuckburgh (1909)]
    (Source)

Original Latin. Alternate translations:

For they seem to take away the sun from the world who withdraw friendship from life; for we receive nothing better from the immortal gods, nothing more delightful.
[tr. Edmonds (1871)]

It is like taking the sun out of the world, to bereave human life of friendship, than which the immortal gods have given man nothing better, nothing more gladdening.
[tr. Peabody (1887)]

Why, they seem to take the sun out of the universe when they deprive life of friendship, than which we have from the immortal gods no better, no more delightful boon.
[tr. Falconer (1923)]

For they seem to remove the sun from the Earth, these people who remove friendship from life, when we have received no better thing, no sweeter thing, from the immortal gods.
[Source]