"We checked our critical weapons at the door." The topic sentence comes from the following context. "Amos was always very funny, and in his presence I became funny as well, so we spent hours of solid work in continuous amusement. The pleasure we found in working together made us exceptionally patient; it is much easier to strive for perfection when you are never bored. Perhaps most important, we checked our critical weapons at the door. Both Amos and I were critical and argumentative, he even more than I,..." Can anyone help explain the meaning of "weapons at the door" here? Thank you.