A person came to the Prophet (Sallallaho alaihe wasallam) and said:

"0 Prophet of Allah! I love you so much." The Prophet (Sallallaho alaihe wasallam):

"Think well before you say this." The person:

"I have already given thought. I love you very much, 0, Prophet of Allah."

The Prophet (Sallallaho alaihe wasallam): "Think once again before you declare such a thing."

The person:

"I still love you very much, 0, Prophet of Allah." The Prophet (Sallallaho alaihe wasallam):

"Well, if you are sincere in what you say, then be prepared to face privation and want coming to you from all directions, for it pursues all those who love me, as swiftly as water running down-stream."

That is why we find the Sahabah living mostly a life of poverty. Similarly the eminent Muhaddithin, Sufi's and theologians lived hand to mouth throughout their life.