The ability of God to know everything – past, present, future – both the actual and potential. Satan only has limited knowledge; if he had a fuller understanding he would not have had Christ crucified (1 Cor 2:8; Heb 2:14).
God sees all man does, and knows the secrets of our hearts as well as the number of days we will live, for nothing is hidden from His sight. He even knows all the sparrows and how many hairs are on our heads (Job 34:21; Ps 44:21, 94:11, 139:15,16, 147:5; Mt 10:29,30; Heb 4:13).
Trust your life into the hands of the all-knowing God
provided for us to walk through the situations of life in the victory He has made available. It is up to us to continually draw on those resources, living and walking in close fellowship with Him by the enabling of the Holy Spirit (Gal 5:16; Eph 5:18).
We can draw on His knowledge and wisdom, however as there are many things we are not able to fully discern (for His ways and thoughts are so much higher than ours) we should not resort to ungodly means to try to obtain such as by using occult powers of divination (Deut 29:29; Isa 55:9). Many times God gives indicators of what is about to happen by communicating His plans to those who have a prophetic voice and we can all ask for a discernment of His will (Amos 3:7; Act 1:24, 15:8). To a large measure His revealed will is outlined in His instruction book for life – the Bible and even those with limited understanding will not err from walking in ways pleasing to God if they live by its directives (Isa 35:8; 2 Tim 3:16,17).
Although He is all-knowing He still loves to hear what's on our heart as we converse with Him in our thoughts and prayers (Ps 4:4, 77:6; Rom 1:10; 1 Thes 5:17; 1 Jn 3:20).