Human beings have the natural inclination to know the truth. To pursue truth we must die to ourselves in a way. in dying to ourselves (our opinions, wants and desires) we spiritually stay alive by replacing our wants and desires with (He who Is) Truth! Notice how this natural inclination, as I called it above, is a natural desire instilled in us to keep our souls alive! God gave us both natural desires to keep the flesh alive, and natural desires to keep our soul alive!