"When you hold back half of our population, we cannot realise 100 per cent of our potential," Ban said at a march held here yesterday from the UN headquarters to Times Square in commemoration of International Women's Day.
"We have to fully respect and use the potential of all of our women," the UN Secretary General said.
Thousands of people gathered for the march aimed at demanding greater efforts by governments to achieve gender equality worldwide.
He recalled that it was 20 years since the Beijing Declaration and sounded a rallying cry for the "step it up" campaign to reach Planet 50:50 by 2030.
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"That's our target. We must make it happen," he said.
"Let's work to make it happen!" said UN Women Director-General Phumzile Mlambo-Ngcuka stressing on how rational equality is and the many benefits that stem from boosting the status of women.
"We know that when there is gender equality, girls and boys will go to school and they will prosper," she said.
Joining Ban and Mlambo-Ngcuka on the platform were several other notables, including Liberian peace activist Leymah Gbowee and British actor Paul Bettany.
Gbowee painted a vivid metaphor to describe the situation that persists in a world without gender quality, saying that by excluding the unique skills of women, global society was functioning "with one eye covered" and that was hampering its progress.