The condition and limit in the obtaining of the spiritual benefits (Isa 55:1-3): (1) Seek the Lord. (2) Seek Him while He is to be found (Isa 65:1; Psa 32:6; Mat 25:1-13; Joh 7:34; Joh 8:21; 2Co 6:2; Heb 2:3; Heb 3:13, Heb 3:15).
call - casting yourselves wholly on His mercy (Rom 10:13). Stronger than “seek”; so “near” is more positive than “while He may be found” (Rom 10:8, Rom 10:9).