至誠一貫：しせいいっかん [shi-sei-i-kkan]

最後まで誠意を貫き通すこと、きわめて誠実なこと。一つの方針・方法・態度で、始めから終わりまでつらぬき通すこと。真心をもって何事にも立ち向かうこと。

To penetrate sincerity to the very end, be extremely sincere. Through a single policy, method, attitude, passing through from the beginning to the end. To confront everything with a heart.