1) First one are those people who are in distress. In our bad times when we are in distress or when we are going through physical or mental agony, at that time we generally remember & pray to God. Such people devote themselves to God because they wish to be liberated from grief.
2) Second one are those people who want to know about the God. Such people have faith in God & want to know more about Him. Such people due to their inquisitiveness, debate about the God, read books etc. to know more about the God.
3) Third one are those people who want to gain wealth in life. There is no end to such people in this world. You can find such people generally in temples etc. asking God to give them wealth, money etc. Such people are those one's who do their appointed task for money because doing it will bring good fortune to them. So such people are the doers of selfish action in life.
4) Fourth one are those people who are people of True knowledge. Such people are really the wise men.They have true knowledge to God. They are the realized sages, who have attained to the stage of reaching the supreme goal.
Below are the verses of Bhagwat Gita which explain about the above said 4 types of devotees.
"chatur-vidha bhajante mam
janah sukritino ’rjuna
arto jijnasur artharthi
jnani cha bharatarsabha" (Bhagwat Gita: Chapter Seven verse 16)
"Sri Krishna said: O Arjuna, four kinds of pious men begin to render devotional service unto Me—the distressed, the inquisitive, the desirer of wealth, and the one who is searching for knowledge of the Absolute."
"udarah sarva evaite
jnani tv atmaiva me matam
asthitah sa hi yuktatma
mam evanuttamam gatim" (Bhagwat Gita: Chapter Seven verse 18)
"Sri Krishna said: All these devotees are undoubtedly magnanimous souls, but he who is situated in knowledge of Me, I consider to be just like My own self. Being engaged in My transcendental service, he/she is sure to attain Me, the highest and most perfect goal."
So just check, which type of devotee of God are you? If you are not the fourth one i.e. a person of True knowledge, a really wise person, then just strive to be the one. Just devote yourself to God, read religious literature, join the company of saintly people, give charities, alms to the people. Doing all such good works & having a yearning for God, you shall certainly become a wise person, a true devotee of God & shall ultimately attain to Him.
Jai Sri Krishna.