Hawzah News Agency – Imam Ali (AS), when asked about gallantry, said,

لاتَفعَلُ شيئاً في السِّرِّ تَستَحيي مِنهُ في العَلانِيَةِ.

'[It is to] Not do something secretly which you would be ashamed to do in public.'

Source: Tuhaf al-Uqul, p. 223