既来之,则安之jì lái zhī zhī zé ān zhī
[since we are here,we may as well stay and make the best of it;now that we have come,let us stay and take the rough with the smooth;now you are here,you'd better stay;since this is so,it's better to accept it and enjoy it] 既已来此,那就随安于此
他果然既来之,则安之,我也只得因居之安,则资之深。——《儿女英雄传》