In a statement marking the 60th Anniversary of Christian Aid week, the charity of which he is chair, he defended Britain's foreign aid budget and urged the country to look outwards as the UK prepares to leave the European Union.
He said: "Britain's political and social landscape is in flux. We face great choices about the soul and future of our nation. For many it is a time of uncertainty and fear, for others an opportunity for change and optimism.
"But, I believe that all of us as individuals can play a vital role in shaping our nation."
Addressing the controversial subject of the foreign aid budget Dr Williams said people should recognise that our good is bound up with that of others:
"We British are famously known for standing up for the underdog and standing firm when things get tough. We do not only look out for those less fortunate than ourselves; we want to meet halfway those working hard to stand on their own two feet.
Williams also said that the money should be used to create long-term benefits: "Effective aid is not about creating dependence but helping people become valued partners and co-workers for a safe and equitable world."
He reiterated his desire for people not to become insular but to look forward to a new future with pride:
"The British public are rightly proud that our great nation hasn't turned its back on the world's poorest people.
"As we enter the general Election period and discuss the future of our country, debate the terms of Brexit and our relationship with the EU, as we also form our new relationship with the world, it is time to wear our aid budget as a badge of honour - one that sets a standard for others to follow."