Nothing stands out so conspicuously, or remains so firmly fixed in the memory, as something which you have blundered. Cicero
I have become a student of the sky and know all the clouds there are and have firmly fixed in mind the various hues of blue that the sky can show. Clifford D. Simak
A thing that is firmly fixed cannot be dislodged except with much trouble. Swahili Proverb
Heaven above, earth below, and his own position firmly fixed. Hawaiian Proverb