Bhakti is of various kinds. One classification is Sakamya and Nishkamya Bhakti. Sakamya Bhakti is devotion with desire for material gains. A man wants wealth with this motive practices Bhakti. Another man wants freedom from diseases and therefore does Japa and offers prayers. A third one wants to become a Minister and does Upasana with this aim. This is Sakamya Bhakti. Whatever you want the Lord will certainly give you, if your Bhakti is intense and if your prayers are sincerely offered from the bottom of your heart. But you will not get supreme satisfaction, immortality and Moksha through Sakamya Bhakti.
Your Bhakti should always be Nishkamya Bhakti. God has already given you a good position, a good job, wife and children and enough wealth. Be contented with these. Aspire for Nishkamya Bhakti. Your heart will be purified and the Divine Grace will descend upon you. Be in communion with the Lord, you will become one with the Lord and you will enjoy all the Divine Aisvaryas (Divine attributes like wisdom, renunciation, power, etc.). All the Vibhutis (Special forms in which the Lord manifests) of the Lord He will give you. He will give you Darsan. He will help you to dwell in Him. At the same time He will give you all the Divine Aisvaryas also.
Another classification of Bhakti is Apara-Bhakti and Para-Bhakti. Apara-Bhakti is for beginners in Yoga. The beginner decorates an image with flowers and garlands, rings the bell, offers Naivedya (food-offerings), wave lights; he observes rituals and ceremonies. The Bhakta here regards the Lord as a Supreme Person, who is immanent in that image and who can be propitiated through that form only.
He has no expanded heart. He is a sectarian. He dislikes other kinds of Bhaktas who worship other Devatas. Gradually, from Apara-Bhakti, the devotee goes to Para-Bhakti, the highest form of Bhakti. He sees the Lord and Lord alone everywhere and feels His Power manifest as the entire universe. "Thou art all-pervading; on what Simhasana shall I seat Thee ? Thou art the Supreme Light, in whose borrowed light the sun, the moon, the stars and the fire shine; shall I wave this little Deepa or light before You ?" - thus the devotee recognizes the transcendental nature of God. Para-Bhakti and Jnana are one. But every Bhakta will have to start from Apara-Bhakti. Before you take your food, offer it to God mentally; and the food will be purified. When you pass through a garden of flowers, mentally offer all the flowers to the Lord in Archana (offering flowers in worship). When you pass through the bazaar and see a sweetmeat shop, offer all the sweetmeats as Naivedya to the Lord. Such practices will lead to Para-Bhakti.
Bhakti is also classified into Gauna-Bhakti and Mukhya-Bhakti. Gauna-Bhakti is the lower Bhakti and Mukhya-Bhakti is the higher type of Bhakti.
Go from stage to stage. Just as a flower grows in the garden, so also gradually develop love or Prem in the garden of your heart.
The enemy of devotion is egoism and desire. Where there is no Kama or desire, there alone will Rama (the Lord) manifest Himself. The enemies of peace and devotion are lust, anger and greed. Anger destroys your peace and your health also. When a man abuses you, keep peaceful. When blood begins to boil, it is impoverished. You lose vitality if you become a prey to fits of temper.