It seems i was wrong. He did not say this two years prior, but in fact in january of 1917. Lenin wrote:

"We of the older generation may not live to see the decisive battles of this coming revolution. But I can, I believe, express the confident hope that the youth which is working so splendidly in the socialist movement of Switzerland, and of the whole world, will be fortunate enough not only to fight, but also to win, in the coming proletarian revolution."

Source: https://www.marxists.org/archive/lenin/works/1917/jan/09.htm