Charles H. Spurgeon on Psalms 108:1

My heart is fixed. The prophet saith his heart was ready, so the old translation hath it; the new translation, "My heart is fixed." The word in the Hebrew signifies, first, ready, or prepared. Then, secondly, it signifies fixed. We first fit, prepare a thing, sharpen it, before we drive it into the ground, and then drive it in and fix it. So ask seriously and often, that thy heart may be ready, and may also be fixed, and this by a habit which brings readiness and fixedness, as in other holy duties, so in that of meditation. —Nathanael Ranew, in "Solitude improved by Divine Meditation," 1670.