Acts 1:7

It is not for you, &c. During the tutelage, as it may be called, of His disciples, our Lord constantly avoided giving a direct answer to enquiries which they addressed to Him. He checked in this way their tendency to speculate on the future, and drew their minds to their duty in the present. Cp. John 21:21-22.

in his own power The word here rendered poweris not the same as that so rendered in the following verse. The sense of this first word is "absolute disposal," and we might well render it authority.