Please help me explain a couplet.

Missing one's ancestors means remembering the morality and fashion of elders and ancestors;

Zude Sun Xian means that the elders should have good moral character and the next generation should be talented;

Hereditary descendants cherish their ancestors and follow the sages from generation to generation: future generations inherit the fine virtues of their ancestors.

Ancestors' praise of Gao De's virtue for thousands of years: praising the fine character of ancestors.