I did not like this. God's promises are given on condition of obedience. We must surrender to Him if we are to be beneficiaries of all His blessings.
What they say in the quote you provided is not in complete agreement with what I learned in my theology classes.
They said:
A covenant and a will are generally different. A covenant is typically a mutual agreement between two or more people, often called a “contract” or “treaty”; in contrast, a will is the declaration of a single person. The Greek translation of the Old Testament, the Septuagint, never translates God’s covenant with Abraham with the Greek word used for mutual agreements or contracts (syntheke). Instead, it uses the word for a testament or a will (diatheke). Why? Probably because the translators recognized that God’s covenant with Abraham was not a treaty between two individuals, where mutually binding promises are made. On the contrary, God’s covenant was based on nothing other than His own will. No string of “ifs, ands, or buts” was attached. Abraham was simply to take God at His word.
A diatheke is also a mutual agreement; not, however, between equals, but between a superior and an inferior. In a syntheke there are mutual obligations or conditions to be fulfilled, and mutual promises. In a diatheke the superior makes all the promises, and states the obligations to be fulfilled by the inferior so that the promises may be fulfilled. The inferior party just accepts or rejects the agreement with its promises and conditions.
A covenant is an agreement between parties, based upon conditions. If Israel would obey the divine law and thus
fulfill the conditions of their covenant with God,
he would verify his promises to them. But what presumption for them to expect a blessing while they were violating the conditions upon which alone it could be bestowed!” {ST, December 22, 1881 par. 5}
“God's people are justified through the administration of the ‘better covenant,’ through Christ's righteousness.
A covenant is an agreement by which parties bind themselves and each other to the fulfillment of certain conditions. Thus the human agent enters into agreement with God to comply with the conditions specified in His Word. His conduct shows whether or not he respects these conditions. Man gains everything by obeying the covenant-keeping God. God's attributes are imparted to man, enabling him to exercise mercy and compassion. ... It is not enough for us to have a general idea of God's requirements. We must know for ourselves what His requirements and our obligations are. The terms of God's covenant are: ‘Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy strength, and with all thy mind; and thy neighbour as thyself’ (Luke 10:27). These are the conditions of life. ‘This do,’ Christ said, ‘and thou shalt live’ (verse 28).” - Ms 148, 1897 {12MR 53.4, 54.1}