My soul, wait thou only upon God - See the notes at Psalms 62:1. There is, in the word used here, and rendered wait, the same idea of rest or repose which occurs in Psalms 62:1. The meaning is, that he would commit the whole cause to God, and that his soul would thus be calm and without apprehension.
For my expectation is from him - In Psalms 62:1, this is salvation. The idea here is, that all that he expected or hoped for must come from God. He did not rely on his fellow men; he did not rely on himself. God alone could deliver him, and he confidently believed that God would do it. Often are we in such circumstances that we feel that our only “expectation” - our only hope - is in God. All our strength fails; all our resources are exhausted; our fellow-men cannot or will not aid us; our own efforts seem to be vain; our plans are frustrated, and we are shut up to the conclusion that God alone can help us. How often is this felt by a Christian parent in regard to the conversion of his children. All his own efforts seem to be vain; all that he says is powerless; his hopes, long-cherished, are disappointed; his very prayers seem not to be heard; and he is made to feel that his only hope is in God - a sovereign God - and that the whole case must be left in His hands. This state of mind, when it is fully reached, is often all that is needful in order that our desires may be granted. It is desirable that this state of mind should be produced; and when it is produced, the prayer is answered.