Above all else, stay away from gloomy people who complain about everything that happens. They find something wrong with absolutely everything. Even if such a person stays loyal and friendly to you, they will still destroy your peace of mind. A companion who is bitter and greets every situation with a groan will ruin your calm.
Above all, however, avoid dismal men who grumble at whatever happens, and find something to complain of in everything. Though he may continue loyal and friendly towards you, still one's peace of mind is destroyed by a comrade whose mind is soured and who meets every incident with a groan.