The waters were made Sweet - Exodus 15:25 

OUR joys and sorrows, like the varied products of nature, lie very close together. One moment we are singing the joyous song of victory on the shores of the Red Sea, and vow we will never again mistrust our God; and then, by a sudden transition, we find ourselves standing beside the Marah waters of pain and disappointment, inclined to murmur at our lot.

There is, however, a tree, which, when cast into the waters, makes them sweet. It is the tree of the cross. "He bare our sins in His own body on the tree." The cross means the yielding up of the will. Now, it is in proportion as we see God's will in the various events of life, and surrender ourselves either to bear or do it, that we shall find earth's bitter things becoming sweet, and its hard things easy.
We must yield our will to God. - The secret of blessedness is in saying "Yes" to the will of God, as it is shown in the circumstances of our lot or the revelations of His Word. It is the will of a Father whose love and wisdom are beyond question.

We must accept what He permits. - It may be that our pains emanate from the malevolence or negligence of others; still, if He has permitted them, they are His will for us. By the time they reach us they have become minted with His die, and we must patiently submit.

We must do all He bids. - The thread of obedience must always be running through our hands. At all costs to our choice and feeling we must not only have His commands, but keep them. Our Lord perpetually lays stress on obeying His words. This is the spirit of the Cross, and the properties of this tree sweeten earth's bitterest sorrows.