Ní ciat súli ní nach aiccet.

Ní ciat súli ní nach aiccet.

(not * weeps * eyes * thing * that not * they see)

Eyes do not weep for what they don't see.

In other words, "ignorance is bliss". We can't be troubled by something we don't know about. Or as a chef once said about kitchen mishaps, "what your guests don't see won't hurt them". This proverb is found in "Brislech Mór Maige Murthemni" (LL 13853).