<span class="chinese-post-title">瞞 天 過 海</span> Deceive the Heavens to Cross the Sea from the <span class="chinese-post-title">三十六計</span> Thirty-Six Stratagems

瞞天過海

備周則意怠；常見則不疑。陰在陽之內，不在陽之對。太陽，太陰。

"Moving about in the darkness and shadows, occupying isolated places, or hiding behind screens will only attract suspicious attention. To lower an enemy's guard you must act in the open hiding your true intentions under the guise of common every day activities."

Quoted from Chinese Classics and Translations