In regard to the first alternative, the control which the mind has over its own train of thought has been definitely pointed out and described in the articles on attention and on the will. It appears that _the will_ is the regulating principle, which governs all mental operations by selecting the modes of happiness which the intellect shall be employed in securing. Whatever mode of present or of general happiness is selected, immediately all conceptions which the judgment discerns as having a fitness for accomplishing this object become vivid and distinct, and recall their associate conceptions. Thus it is the choice of any mode of enjoyment by the will which determines the train of thought. When, therefore, any question is brought up which demands attention to evidence, if the mind has some desire to gratify, and the intellect discerns that the conviction of this truth will interfere with this chosen plan of happiness, the will refuses attention to what is not in consonance with the leading desire of the mind. Where conviction of any truth is foreseen to interfere with some plan of enjoyment already chosen, the only way by which attention can be secured is by exhibiting some evil that will follow inattention which will more than counterbalance the good to be gained. In this case, the mind may choose to attend, and run the hazard of losing the particular mode of enjoyment sought in order to avoid the threatened evil from inattention to evidence. This is the method men pursue in all their intercourse with each other. They find that their fellow-men are unwilling to believe what is contrary to their own wishes and plans. But when they determine that belief shall be secured, they contrive various modes to make it appear either for their pleasure or their interest to attend to evidence, or else they exhibit some evil as the consequence of neglecting attention. The only mode by which mankind are induced to give their thoughts to the concerns of an invisible world is by awakening their hopes of future good to be secured, or by stimulating their fears of future evils. It thus appears, from the laws and operations of the mind of which every person is conscious, and also from the conduct and recorded experience of mankind, that the mind _has_ the power of directing its attention to evidence. The other alternative which would establish the principle that belief is not under the control of the will is, that truth, when seen by the mind, can not be distinguished from falsehood. But this, it can be seen, involves a denial of the principles of reason and common sense. It is saying that the mind may have the evidence of the senses, memory, and all the other principles included in the laws of reason, and yet not believe it; for every process of reasoning is, in fact, exhibiting evidence either of the senses, memory, or experience, that a certain truth is included under a primary truth.