"True peace of heart, then, is found resisting passions, not in satisfying them. There is no peace in the carnal man, in the man given to vain attractions, but there is peace in the fervent and spiritual man." Source: Thomas a’ Kempis, The Imitation of Christ, Dover Thrift Editions, 1940.
"That to arrive at such resignation as God requires, we should watch attentively over all passions which mingle as well in spiritual things as in those of a grosser nature; that God would give light concerning those passions to those who truly desire to serve Him." Source: Brother Lawrence, The Practice of the Presence [...]