Charles H. Spurgeon on Psalms 62:10

If riches increase, set not your heart upon them. We naturally love riches, and therefore as naturally spend many thoughts, both how to get and how to keep them. If a man have riches, or an increase in riches, it is not unlawful for him to think of them (yet we should be as sparing of our thoughts that way as may be, our thoughts and the bent of our souls should always be upon God), but that which the psalmist forbids is the settling of our hearts; as if he had said, Let not your thoughts stay or dwell here. Riches are themselves transient things, therefore they should have but our transient thoughts. Set not your hearts upon them, for they may quickly be unsettled. Samuel bespoke Saul in the same language about a worldly concernment, when he went out to seek his father's asses: "Set not thy mind on them." 1Sa 9:20. It is like Saul was overburdened with this thought, "What's become of, or what shall I do for, my father's asses?" "Be not solicitous about them, "saith Samuel, "greater things are towards thee." Joseph Caryl.