The part of wisdom is to treasure up experience, and hold it ready for use in the time and place of need. Everything may be turned to account. In the process of accumulating this species of wealth, the wonders of the philosopher's stone may be more than realised. Even losses can be converted into gains. Every mistake or disappointment is a new lesson. Every fault you commit, and every glow of shame which suffuses your face because of it, may be changed into a most valuable piece of wisdom. Let nothing trickle out, and flow away useless. After one has bought wit at a heavy price, it is a double misfortune to throw it away. As a general rule, the dearer it is the more useful it will be.--_Arnot._ _MAIN HOMILETICS OF THE PARAGRAPH.--Verses_ 15, 16. A FALSE AND A TRUE ESTIMATE OF LIFE. +I. A false estimate of life in its relation to riches.+ It is a mistake to look on wealth as a "strong city" in which we can be secure from the evils of life. A commander, who knows that there is behind him a fortress into which he can retire in case of need, may be brought to ruin by forming an over-estimate of its security. He may underrate the ability of the enemy to follow him thither. Strongholds have been undermined, and those who had trusted in their strength have been destroyed by that very confidence; or pestilence has broken out on account of the number who have taken refuge in the fortress, and so that which they deemed their strength has been their weakness. These events have proved that the estimate taken of their safety was a wrong one--that even the refuge itself might be the cause of destruction. So with a "rich man's wealth." If he looks upon it as a resource under all emergencies--if he thinks it can purchase him immunity from all ills--he is a terrible self-deceiver. Wealth cannot drive back disease; nothing can keep death from storming his stronghold; and sometimes a single day brings together such an army of adverse circumstances that the strong city goes down before it, and is never rebuilt, or the very refuge itself is the cause of moral ruin. Therefore "Let not the rich man glory in his riches" (Jer. ix. 23).