God puts a desire in our hearts to know Him. When we respond to that desire and start looking for Him, He reveals Himself to us. 

For I know the plans I have for you,” declares God, “plans to prosper you and not to harm you, plans to give you hope and a future. Then you will call on me and come and pray to me, and I will listen to you. You will seek me and find me when you seek me with all your heart. I will be found by you,” declares God. Jeremiah 29:11-14