Psalms 119:73 , Psalms 119:116
I. Consider the care of the Creator for the lower creatures of His hand. The lower creatures have instincts given to them by God for their preservation. These instincts are adapted to their wants, and they never mislead the creatures to which they are given. In man's spiritual nature, so far removed above the level of the beasts, we find certain instincts implanted by God instincts evidently given to us to be to our souls in a spiritual way just the same sort of guide that the instincts of the lower creatures are to them in a bodily way.
II. Let us see what these spiritual instincts are. (1) Conscience. We have within us a moral instinct which directs us towards that which is good, which warns us against that which is wrong. Why does God give us this instinct, why does He speak to us through and by it, but because He would guard us from spiritual evil? (2) The sense of justice. This sense of justice is as purely an instinctive feeling as any that man has. And this being so, does it not bear witness to the nature of that Divine Being who has implanted it in man? (3) Prayer is an instinct of the soul of man.
III. It is certainly true that many of the highest of our instinctive moral feelings and powers point towards a life beyond the grave. The whole energy of our spiritual nature does so. For what is this hope that burns within us so vehemently? What is this but an instinctive feeling of our nature? Deep as our faith in God Himself is seated the hope of a life beyond the grave. It is not a belief which is derived from the outward world. It has its roots deep in man's spiritual nature; it springs from the depths of the soul an instinct implanted by God to guide man to his distant home. The psalmists had not received the blessed promises of God in Christ; yet they believed that at God's right hand there are pleasures for evermore, so plainly do the spiritual instincts which God has given to man confirm the blessed promises of God in Christ.
G. Forbes, The Voice of God in the Psalms,p. 109.
References: Psalms 119:83. Spurgeon, Sermons,vol. ii., No. 71; S. Cox, Expositions,2nd series, p. 19. Psalms 119:88. Spurgeon, Sermons,vol. xxx., No. 1779. Psalms 119:89-91. S. Cox, Expositions,2nd series, p. 34.Psalms 119:89-92. Spurgeon, Sermons,vol. xxviii., No. 1656.