Jamieson, Fausset and Brown on 1 Timothy 2:4

4. "Imitate God." Since He wishes that all should be saved, do you also wish it; and if you wish it, pray for it. For prayer is the instrument of effecting such things [Chrysostom]. Paul does not say, "He wishes to save all"; for then he would have saved all in matter of fact; but "will have all men to be saved," implies the possibility of man's accepting it (through God's prevenient grace) or rejecting it (through man's own perversity). Our prayers ought to include all, as God's grace included all.

to come--They are not forced.

unto the knowledge--Greek, "the full knowledge" or "recognition" (See on 1Co 13:12; Php 1:9).

the truth--the saving truth as it is in, and by, Jesus (Joh 17:3, 17).