Read a work on the "Evidences ...

Read a work on the "Evidences of Christianity," and it may become highly probable that Christianity, etc., are true. This is an opinion. Feel God. Do His will, till the Absolute Imperative within you speaks as with a living voice, "Thou shalt, and thou shalt not;" and then you do not think, you know that there is a God.
 Frederick William Robertson

Quotes from the same author

The truest definition of evil is that which represents it as something contrary to nature; evil is evil because it is unnatural; a vine which should bear olive-berries, an eye to which blue seems yellow, would be diseased; an unnatural mother, an unnatural son, an unnatural act, are the strongest terms of condemnation.
 Frederick William Robertson
Every day His servants are dying modestly and peacefully--not a word of victory on their lips; but Christ's deep triumph in their hearts--watching the slow progress of their own decay, and yet so far emancipated from personal anxiety that they are still able to think and plan for others, not knowing that they are doing any great thing. They die, and the world hears nothing of them; and yet theirs was the completest victory. They came to the battle field, the field to which they had been looking forward all their lives, and the enemy was not to be found. There was no foe to fight with.
 Frederick William Robertson
Mourning after an absent God is an evidence of a love as strong, as rejoicing in a present one.
 Frederick William Robertson
He in whose heart the law was, and who alone of all mankind was content to do it, His sacrifice alone can be the sacrifice all-sufficient in the Father's sight as the proper sacrifice of humanity; He who through the Eternal Spirit offered Himself without spot to God, He alone can give the Spirit which enables us to present our bodies a living sacrifice, holy and acceptable to God. He is the only High-Priest of the universe.
 Frederick William Robertson
Do you wish to become rich? You may become rich, that is, if you desire it in no half way, but thoroughly. A miser sacrifices all to his single passion; hoards farthings and dies possessed of wealth. Do you wish to master any science or accomplishment? Give yourself to it and it lies beneath your feet. Time and pains will do anything. This world is given as the prize for the men in earnest; and that which is true of this world is truer still of the world to come.
 Frederick William Robertson