Bhaktisiddhanta Sarasvati Thakura advocated that every devotee, under the guidance of an expert spiritual master, preach the bhakti cult, Krishna consciousness, all over the world.
A devotee should not be proud of his acquisitions. The symptoms of a devotee are meekness and humility. Although spiritually very advanced, he will always remain meek and humble, as Krishna Das Kaviraja Gosvami and all the other Vaisnavas have taught us by personal example. Caitanya Mahaprabhu taught that one should be humbler than the grass on the street and more tolerant than the tree. One should not be proud or falsely puffed up. In this way one will surely advance in spiritual life.
A devotee should always try to hear about spiritual matters and should always utilize his time in chanting the holy name of the Lord. His behavior should always be straightforward and simple, and although he is not envious but friendly to everyone, he should avoid the company of persons who are not spiritually advanced.
The only condition for successfully executing spiritual activities is that they must be conducted under the guidance of a pure devotee who is completely free from all mundane desires.