Christian's Primary Obligation

There are many who would burden the believer with rules and laws stating that they are "gospel issues". But in this collection of sermons from the emminent Puritan Hugh Binning he expounds from Scripture the primary obligation of the beleiver and how it should be lived out.
Quotes:
"If ye seek satisfaction in this present world, ye shall be disappointed."
"A man cannot be happy in a marble palace, for the soul is created with an infinite capacity to receive God, and all the world will not fill his room."
"If God loved riches well, do ye think he would give them so liberally, and heap them up upon some base covetous wretches? Surely no."
"Ye must go out of yourselves to seek happiness. Then I pray you, go not downward. It is not there, but misery is there."