The full Mao quotation: 

The world is yours, as well as ours, but in the last analysis, it is yours. You young people, full of vigour and vitality, are in the bloom of your life, like the sun at eight or nine in the morning. Our hope is placed on you. ............ The world belongs to you. China's future belongs to you. Mao Zedong. 

世界是你们的，也是我们的，但是归根结底是你们的。你们青年人朝气蓬勃，正在兴旺时期，好象早晨八、九点钟的太阳。希望寄托在你们身上。............. 世界是属于你们的。中国的前途是属于你们的。毛泽东

Mao made this remark during a talk with Chinese exchange students and researchers in Moscow, 17 November 1957. It was included in  the Little Red Book, at the start of chapter 30 "Youth".

The image was also used on BG E13/777.

Print no. 7150, third printing.