If any one note is dropped from the divine harmony of truth the music may be sadly marred. Your people may fall into grave spiritual diseases through the lack of a certain form of spiritual nutriment, which can only be supplied by the doctrines which you withhold.... We must preach "the whole truth," that the man of God may be thoroughly furnished unto all good works....
Since conversion is a divine work, we must take care that we depend entirely upon the Spirit of God, and look to Him for power over men's minds. [If] we were more truly sensible of our need of the Spirit of God, should we not...pray more importunately to be anointed with His sacred unction...? Do we not fail in many of our efforts, because we practically, though not doctrinally, ignore the Holy Ghost...? [We] are instruments in His hand, and nothing more.
—C. H. Spurgeon, Lectures to My Students, pp. 336-37
Nothing goes further to help one understand the Bible than the purpose to obey it.... Nothing clears the mind like obedience; nothing darkens the mind like disobedience. To obey a truth you see prepares you to see other truths. To disobey a truth you see darkens your mind to all truths.
—R. A. Torrey, How to Succeed in the Christian Life, pp. 60-61