Psalms 57:7

By lively faith, David's prayers and complaints are at once turned into praises. His heart is fixed; it is prepared for every event, being stayed upon God. If by the grace of God we are brought into this even, composed frame of mind, we have great reason to be thankful. Nothing is done to purpose, in religion, unless it is done with the heart. The heart must be fixed for the duty, put in frame for it; fixed in the duty by close attention. Our tongue is our glory, and never more so than when praising God; dull and sleepy devotions will never be acceptable to God. Let us awake early in the morning, to begin the day with God; early in the beginning of a mercy. When God comes toward us with his favours, let us go forth to meet him with our praises. David desired to bring others to join in praising God; and in his psalms, he is still praising God among the people, singing to Him among the nations. Let us seek to have our hearts fixed to praise his boundless mercy and unfailing faithfulness; and to glorify him with body, soul, and spirit, which are his. Let us earnestly pray that the blessings of the gospel may be sent through every land.

My heart is fixed. One would have thought he would have said, "My heart is fluttered; "but no, he is calm, firm, happy, resolute, established. When the central axle is secure, the whole wheel is right. If our great bower anchor holds, the ship cannot drive. O God, my heart is fixed. I am resolved to trust thee, to serve thee, and to praise thee. Twice does he declare this to the glory of God who thus comforts the souls of his servants. Reader, it is surely well with thee, if thy once roving heart is now firmly fixed upon God and the proclamation of his glory. I will sing and give praise. Vocally and instrumentally will I celebrate thy worship. With lip and with heart will I ascribe honour to thee. Satan shall not stop me, nor Saul, nor the Philistines, I will make Adullam ring with music, and all the caverns thereof echo with joyous song. Believer, make a firm decree that your soul in all seasons shall magnify the Lord.

"Sing, though sense and carnal reason

Fain would stop the joyful song:

Sing, and count it highest treason

For a saint to hold his tongue."