In the first sample for Isaiah chapter 55, the Lord makes a connection to the 55^th book of the Bible with the importance of hearing and obeying the word of God, to receive the promise of life.

ISAIAH 55
2 …hearken diligently unto me…
3 Incline your ear, and come unto me: hear, and your soul shall live; I will make an everlasting covenant with you…

II TIMOTHY 1
1 …according to the promise of life which is in Jesus Christ,
10…Jesus Christ, who hath abolished death, and hath brought life…
13 Hold fast the form of sound words, which thou hast heard of me…
II TIMOTHY 2
2 And the things that thou hast heard of me among many witnesses…
II TIMOTHY 4
3 For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears;
4 And they shall turn away their ears from the truth, and shall be turned unto fables.

In the second sample, the Lord makes a connection with the need to forsake flee unrighteousness and call on the Lord.

ISAIAH 55
6 Seek ye the LORD while he may be found, call ye upon him while he is near:
7 Let the wicked forsake his way, and the unrighteous man his thoughts…

II TIMOTHY 2
22 Flee also youthful lusts: but follow righteousness, faith, charity, peace, with them that call on the Lord out of a pure heart.