Imitation of Christ

Serva te tanquam peregrinum et hospitem super terram, ad quem nihil spectat de mundi negociis. Serva cor liberum, et ad Deum sursum erectum, quia non habes hic manentem civitatem. Illuc gemitus et preces quotidianas cum lacrymis dirige, ut spiritus tuus mereatur post mortem ad Dominum feliciter transire. 

Keep yourself as a stranger and a pilgrim upon the earth, to whom the things of the world don't apply. Keep your heart free, and lifted up towards God, for here we have no continuing city. To Him direct your daily prayers with crying and tears, that your spirit may be found worthy to pass happily after death unto its Lord.

Imitation of Christ, I, 23:9