During his time as a missionary, Bradley was frequently at odds with his mission sponsors. On 4 December 1847, Bradley resigned from the ABCFM due to his disagreement with the organization on the doctrine of Christian perfectionism. With no funds coming from the ABCFM, Bradley was forced to take a three−year sojourn in the US to raise funds to continue in Bangkok under the sponsorship of another organization. His time in America raising funds and betrothing his second wife was the only break in Bradley's time in Bangkok.