What Is "Speaking Our Own Words"?
"Talking upon anything or everything which may come into the mind is speaking our own words." See below
Isaiah 58:13-14 (NKJV) 13 “If you turn away your foot from the Sabbath,
From doing your pleasure on My holy day,
And call the Sabbath a delight,
The holy day of the Lord honorable,
And shall honor Him, not doing your own ways,
Nor finding your own pleasure,
Nor speaking your own words,
14 Then you shall delight yourself in the Lord;
And I will cause you to ride on the high hills of the earth,
And feed you with the heritage of Jacob your father.
The mouth of the Lord has spoken.”
"God requires not only that we refrain from physical labor upon the Sabbath, but that the mind be disciplined to dwell upon sacred themes. The fourth commandment is virtually transgressed by conversing upon worldly things or by engaging in light and trifling conversation. Talking upon anything or everything which may come into the mind is speaking our own words. Every deviation from right brings us into bondage and condemnation." {2T 702.1} ... You have frequently failed to “remember the Sabbath day, to keep it holy;” you have often forgotten, and have spoken your own words upon God’s sanctified day. You have been unguarded, and have upon the Sabbath joined with the unconsecrated in conversation upon the common topics of the day, such as gains and losses, stocks, crops, and provisions. In this your example injures your influence. You should reform." {2T 703.1}
The words and thoughts should be guarded. Those who discuss business matters and lay plans on the Sabbath, are regarded of God as though they engaged in the actual transaction of business. To keep the Sabbath holy, we should not even allow our minds to dwell upon things of a worldly character. {CCh 269.3}