土积而成山阜，水积而成江河。
出自汉·桓宽《盐铁论·执务》。阜，土山。土积得多便会成山，水积得多便成江河。此以积土成山、积水成河为喻，说明积少成多、凡事要从一点一滴做起的道理。
Day 2 companies make high-quality decisions, but they make high-quality decisions slowly. To keep the energy and dynamism of Day 1, you have to somehow make high-quality, high-velocity decisions.