18 The Lord is near to all who call on him, to all who call on him in truth.
The Lord God is indeed near for all of us who call upon Him, but only for those that are in Him. God extends His grace to all, which is called common grace to those who are not called. Reading through the rest of this Psalm we see who God calls, those who fear Him, those who love Him. He hears their cry and saves them. The message of salvation is an open invitation to all who come under the hearing of the word, Romans 10:17, which is why we must take the gospel out to all parts of the world. We must fulfill the gospel command in Matthew 28:19, and preach to all, allowing the Holy Spirit to do the work.