Who wrote to England, "My present policy is based on mercy without any weakness; it will not affect the government supremacy"?

Who wrote to England, "My present policy is based on mercy without any weakness; it will not affect the government supremacy"?

انگلینڈ کو کس نے لکھا ، "میری موجودہ پالیسی بغیر کسی کمزوری کے رحمت پر مبنی ہے۔ اس سے حکومت کی بالادستی پر اثر نہیں پڑے گا"؟
Explanation

Lord Canning was the first Viceroy of India after the Indian Rebellion of 1857.

He was serving from 1858 to 1862.

His policy of "mercy without weakness" aimed at restoring stability and maintaining British control over India after the rebellion.