Joseph Smith said

“Notwithstanding this congregation profess to be Saints, yet I stand in the midst of all [kinds of] characters and classes of men. If you wish to go where God is, you must be like God, or possess the principles which God possesses, for if we are not drawing towards God in principle, we are going from Him and drawing towards the devil. Yes, I am standing in the midst of all kinds of people. Search your hearts, and see if you are like God. I have searched mine, and feel to repent of all my sins.

As far as we degenerate from God, we descend to the devil and lose knowledge, and without knowledge we cannot be saved, and while our hearts are filled with evil, we are studying evil, there is no room in our hearts for good, or studying good. Is not God good? Then you be good; if He is faithful, then you be faithful. Add to your faith virtue, to virtue knowledge, and seek for every good thing.

The Church must be cleansed, and I proclaim against all iniquity. A man is saved no faster than he gets knowledge, for if he does not get knowledge, he will be brought into captivity by some evil power in the other world, as evil spirits will have more knowledge, and consequently more power than many men who are on the earth. Hence it needs revelation to assist us, and give us knowledge of the things of God. What is the reason that the Priests of the day do not get revelation? They ask only to consume it upon their lusts.” (Teachings of the Prophet Joseph Smith Pg. 216-217)

Thy mind, O man! if thou wilt lead a soul unto salvation, must stretch as high as the utmost heavens, and search into and contemplate the darkest abyss, and the broad expanse of eternity—thou must commune with God. How much more dignified and noble are the thoughts of God, than the vain imaginations of the human heart! None but fools will trifle with the souls of men. (Teachings of the Prophet Joseph Smith Pg. 137)