Practical wisdom is only to be learned in the school of experience. Precepts and instruction are useful so far as they go, but, without the discipline of real life, they remain of the nature of theory only.
Samuel SmilesTrue politeness is consideration for the opinions of others. It has been said of dogmatism that it is only puppyism come to its full growth; and certainly the worst form this quality can assume is that of opinionativeness and arrogance.
Samuel Smiles