" Such sins, even if they do not kill all grace in us, do harm, nevertheless; and though they are only venial in themselves, they make us apt, ready, and inclined to lose grace and to fall into mortal sin. "
- Johannes Tauler

In simple terms, this quote suggests that even minor sins can have a detrimental effect on one's spiritual life, despite not necessarily leading to severe consequences by themselves. These small misdeeds might weaken an individual’s moral resilience and make them more susceptible to committing graver offenses later on.

The deeper meaning of the quote lies in its warning about the cumulative impact of seemingly insignificant actions or behaviors. It suggests that while minor sins may not have immediate, catastrophic effects, they can still erode one's spiritual integrity over time. This erosion can lead individuals down a path where they become more inclined to commit serious transgressions. The message here is about maintaining high moral standards consistently, as even small deviations can set a dangerous precedent and open the door to larger problems in the future.

Johannes Tauler was a prominent figure of the German Brethren movement within late medieval Christianity, known for his profound sermons and writings on spirituality and ethics. His teachings emphasized personal faith and the importance of inner spiritual transformation as opposed to external religious observances. The quote reflects his broader theme that true righteousness requires constant vigilance against even minor moral failings.